X.

X
X (&ebreve_;ks). X, the twenty-fourth letter of the English alphabet, has three sounds; a compound nonvocal sound (that of ks), as in wax; a compound vocal sound (that of gz), as in example; and, at the beginning of a word, a simple vocal sound (that of z), as in xanthic. See Guide to Pronunciation, §§ 217, 270, 271.
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The form and value of X are from the Latin X, which is from the Greek Χ, which in some Greek alphabets had the value of ks, though in the one now in common use it represents an aspirated sound of k.
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Xanthamide
Xanth*am"ide (?), n. [Xanthic + amide.] (Chem.) An amido derivative of xanthic acid obtained as a white crystalline substance, C2H5O.CS.NH2; -- called also xanthogen amide.
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Xanthate
Xan"thate (?), n. [See Xanthic.] (Chem.) A salt of xanthic; a xanthogenate.
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Xanthelasma
Xan`the*las"ma (?), n. [NL.; Gr. xanqo`s yellow + 'e`lasma a metal plate.] (Med.) See Xanthoma.
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Xanthian
Xan"thi*an (?), a. Of or pertaining to Xanthus, an ancient town on Asia Minor; -- applied especially to certain marbles found near that place, and now in the British Museum.
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Xanthic
Xan"thic (?), a. [Gr. xanqo`s yellow: cf. F. xanthique.]
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1. Tending toward a yellow color, or to one of those colors, green being excepted, in which yellow is a constituent, as scarlet, orange, etc.
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2. (Chem.) (a) Possessing, imparting, or producing a yellow color; as, xanthic acid. (b) Of or pertaining to xanthic acid, or its compounds; xanthogenic. (c) Of or pertaining to xanthin.
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Xanthic acid (Chem.), a heavy, astringent, colorless oil, C2H5O.CS.SH, having a pungent odor. It is produced by leading carbon disulphide into a hot alcoholic solution of potassium hydroxide. So called from the yellow color of many of its salts. Called also xanthogenic acid. -- Xanthic colors (Bot.), those colors (of flowers) having some tinge of yellow; -- opposed to cyanic colors. See under Cyanic.
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Xanthide
Xan"thide (?), n. [See Xantho-.] (Chem.) A compound or derivative of xanthogen. [Archaic]
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Xanthidium
Xan*thid"i*um (?), n.; pl. Xanthidia (?). [NL., fr. Gr. xanqo`s yellow.] (Bot.) A genus of minute unicellular algae of the desmids. These algae have a rounded shape and are armed with glochidiate or branched aculei. Several species occur in ditches, and others are found fossil in flint or hornstone.
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Xanthin
Xan"thin (?), n. [Gr. xanqo`s yellow.] 1. same as xanthine.
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2. (Chem.) A yellow insoluble coloring matter extracted from yellow flowers; specifically, the coloring matter of madder. [Formerly written also xanthein.]
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3. (Chem.) One of the gaseous or volatile decomposition products of the xanthates, and probably identical with carbon disulphide. [Obs.]
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Xanthin
Xanthine
{ Xan"thine (?), n. Also Xan"thin }. [Gr. xanqo`s yellow.] (Physiol. Chem.) A type of purine obtainable as a white microcrystalline powder, C5H4O2N4, present in muscle tissue, in the liver, spleen, pancreas, and other organs, and also in urine (in small quantities) and some urinary calculi, and in the juices of certain plants; -- so called because it leaves a yellow residue when evaporated to dryness with nitric acid. It is also present in guano. Xanthine is closely related to uric acid.
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Xanthinine
Xan"thi*nine (?), n. [Gr. xanqo`s yellow + quinine.] (Chem.) A complex nitrogenous substance related to urea and uric acid, produced as a white powder; -- so called because it forms yellow salts, and because its solution forms a blue fluorescence like quinine.
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Xanthium
Xan"thi*um (?), n. [NL., fr. Gr. xa`nqion a plant used for dyeing the hair yellow, said to be the Xanthium strumarium, from xanqo`s yellow.] (Bot.) A genus of composite plants in which the scales of the involucre are united so as to form a kind of bur; cocklebur; clotbur.
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Xantho-
Xan"tho- (?). A combining form from Gr. xanqo`s yellow; as in xanthocobaltic salts. Used also adjectively in chemistry.
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Xanthocarpous
Xan`tho*car"pous (?), a. [Xantho- + Gr. karpo`s fruit.] (Bot.) Having yellow fruit.
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Xanthochroi
Xan*thoch"ro*i (?), n. pl. [NL. See Xanthochroic.] (Ethnol.) A division of the Caucasian races, comprising the lighter-colored members.
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The Xanthochroi, or fair whites, . . . are the prevalent inhabitants of Northern Europe, and the type may be traced into North Africa, and eastward as far as Hindostan. Tylor.
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Xanthochroic
Xan`tho*chro"ic (?), a. [Xantho- + Gr. chro`a color.] (Ethnol.) Having a yellowish or fair complexion; of or pertaining to the Xanthochroi.
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Xanthochroid
Xan"tho*chroid (?), a. [See under Xanthrochroic, -oid.] (Ethnol.) Having a yellowish or fair complexion. -- n. A person having xanthochroid traits.
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Xanthochroism
Xan*thoch"ro*ism (?), n. Abnormal coloration of feathers in which yellow replaces the normal color, as in certain parrots. It is commonly due to lack of the dark pigment which with yellow forms green.
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Xanthodontous
Xan`tho*don"tous (?), a. [Xantho- + Gr. 'odoy`s, 'odo`ntos, tooth.] Having yellow teeth.
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Xanthogen
Xan"tho*gen (?), n. [Xantho- + -gen.] (Chem.) (a) The hypothetical radical supposed to be characteristic of xanthic acid. [Archaic] (b) Persulphocyanogen. [R.]
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Xanthogenate
Xan"tho*gen*ate (?), n. (Chem.) A salt of xanthic acid.
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Xanthogenic
Xan`tho*gen"ic (?), a. [See Xantho-, and -gen.] (Chem.) Producing a yellow color or compound; xanthic. See Xanthic acid, under Xanthic.
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Xanthoma
Xan*tho"ma (?), n. [NL. See Xantho-, and -oma.] (Med.) A skin disease marked by the development or irregular yellowish patches upon the skin, especially upon the eyelids; -- called also xanthelasma.
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Xanthomatous
Xan*thom"a*tous (?), a. (Med.) Of or pertaining to xanthoma.
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Xanthomelanous
Xan`tho*mel"a*nous (?), a. [Pref. xantho- + Gr. &unr_;, &unr_;, black.] (Ethnol.) Of or pertaining to the lighter division of the Melanochroi, or those races having an olive or yellow complexion and black hair.
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Xanthophane
Xan"tho*phane (?), n. [Xantho- + Gr. fai`nein to show.] (Physiol.) The yellow pigment present in the inner segments of the retina in animals. See Chromophane.
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Xanthophyll
Xan"tho*phyll (?), n. [Xantho- + Gr. fy`llon leaf.] (Bot.) A yellow coloring matter found in yellow autumn leaves, and also produced artificially from chlorophyll; -- formerly called also phylloxanthin.
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Xanthopous
Xan"tho*pous (?), a. [Xantho- + Gr. poy`s, podo`s, foot.] (Bot.) Having a yellow stipe, or stem.
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Xanthoproteic
Xan`tho*pro*te"ic (?), a. (Physiol. Chem.) Pertaining to, or derived from, xanthoprotein; showing the characters of xanthoprotein; as, xanthoproteic acid; the xanthoproteic reaction for albumin.
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Xanthoprotein
Xan`tho*pro"te*in (?), n. [Xantho- + protein.] (Physiol. Chem.) A yellow acid substance formed by the action of hot nitric acid on albuminous or proteid matter. It is changed to a deep orange-yellow color by the addition of ammonia.
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Xanthopuccine
Xan`tho*puc"cine (?), n. [Xantho- + puccoon + -ine.] (Chem.) One of three alkaloids found in the root of the yellow puccoon (Hydrastis Canadensis). It is a yellow crystalline substance, and resembles berberine.
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Xanthorhamnin
Xan`tho*rham"nin (?), n. [Xantho- + NL. Rhamnus, the generic name of the plant bearing Persian berries.] (Chem.) A glucoside extracted from Persian berries as a yellow crystalline powder, used as a dyestuff.
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Xanthorhiza
Xan`tho*rhi"za (?), n. [NL., fr. Gr. xanqo`s yellow + "ri`za root.] (Bot.) A genus of shrubby ranunculaceous plants of North America, including only the species Xanthorhiza apiifolia, which has roots of a deep yellow color; yellowroot. The bark is intensely bitter, and is sometimes used as a tonic.
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Xanthorhoea
Xan`tho*rhoe"a (?), n. [NL., from Gr. xanqo`s yellow + "rei^n to flow.] (Bot.) A genus of endogenous plants, native to Australia, having a thick, sometimes arborescent, stem, and long grasslike leaves. See Grass tree.
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Xanthose
Xan"those (?), n. (Chem.) An orange-yellow substance found in pigment spots of certain crabs.
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Xanthosis
Xan*tho"sis (?), n. [NL., fr. Gr. xanqo`s yellow.] (Med.) The yellow discoloration often observed in cancerous tumors.
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Xanthospermous
Xan`tho*sper"mous (?), a. [Xantho- + Gr. spe`rma sperm.] (Bot.) Having yellow seeds.
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Xanthous
Xan"thous (?), a. [Gr. xanqo`s yellow.] Yellow; specifically (Ethnol.), of or pertaining to those races of man which have yellowish, red, auburn, or brown hair.
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Xanthoxylene
Xan*thox"y*lene (?), n. [See Xanthoxylum.] (Chem.) A liquid hydrocarbon of the terpene series extracted from the seeds of a Japanese prickly ash (Xanthoxylum pipertium) as an aromatic oil.
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Xanthoxylum
Xan*thox"y*lum (?), n. [NL., from Gr. xanqo`s yellow + xy`lon wood.] (Bot.) A genus of prickly shrubs or small trees, the bark and rots of which are of a deep yellow color; prickly ash.
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&hand_; The commonest species in the Northern United States is Xanthoxylum Americanum. See Prickly ash, under Prickly.
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Xe
Xe (?), n. The chemical symbol for the chemical element xenon, having atomic number 54; it is one of the six noble gases.
Syn. -- xenon.
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Xebec
Xe"bec (zē"b&ebreve_;k), n. [Sp. jabegue, formerly spelt xabeque, or Pg. xabeco; both from Turk. sumbeki a kind of Asiatic ship; cf. Per. sumbuk, Ar. sumbūk a small ship.] (Naut.) A small three-masted vessel, with projecting bow and stern and convex decks, used in the Mediterranean for transporting merchandise, etc. It carries large square sails, or lateen sails, or both. Xebecs were formerly armed and used by corsairs.
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Xeme
Xeme (zēm), n. (Zool.) An Arctic fork-tailed gull (Xema Sabinii).
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Xenarthra
Xen*ar"thra prop. n. The suborder of mammals including the armadillos, American anteaters, and sloths.
Syn. -- suborder Xenarthra.
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Xenelasia
Xen`e*la"si*a (?), n. [NL., from Gr. xenhlasi`a expulsion of strangers.] (Gr. Antiq.) A Spartan institution which prohibited strangers from residing in Sparta without permission, its object probably being to preserve the national simplicity of manners.
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Xenicidae
Xe*ni"ci*dae (?), pr. n. A natural family of birds comprising the New Zealand wrens, synonymous with Acanthisittidae.
Syn. -- family Xenicidae, Acanthisittidae, family Acanthisittidae.
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Xenicus
Xe"ni*cus (?), pr. n. The type genus for the bird family Xenicidae.
Syn. -- genus Xenicus.
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Xenium
Xe"ni*um (zē"n&ibreve_;*ŭm), n.; pl. Xenia (zē"n&ibreve_;*&adot_;). [L., from Gr. xe`nion gift to a guest, fr. xe`nos guest.] (Class. Antiq.) A present given to a guest or stranger, or to a foreign ambassador.
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Xenodochium
Xen`o*do*chi"um (z&ebreve_;n`&ouptack_;*d&ouptack_;*kī"ŭm), n. [LL., fr. L. xenodochium a building for the reception of strangers, Gr. xenodochei^on .] (a) (Class. Antiq.) A house for the reception of strangers. (b) In the Middle Ages, a room in a monastery for the reception and entertainment of strangers and pilgrims, and for the relief of paupers. [Called also Xenodocheion.]
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Xenodochy
Xe*nod"o*chy (?), n. [Gr. xenodochi`a.] Reception of strangers; hospitality. [R.]
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Xenon
Xen"on (z&ebreve_;n"&obreve_;n; zē"n&obreve_;n), n. [Gr. xe`non, neut. of xe`nos strange.] (Chem.) A very heavy, inert gaseous element of the noble gas group, occurring in the atmosphere in the proportion of one volume is about 20 millions. It was discovered by Ramsay and Travers in 1898. It can be condensed to a liquid boiling at -107° C., and to a solid which melts at -111.9° C. Symbol Xe (formerly also X); atomic number 54; atomic weight 131.3.
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Xenogamy
Xe*nog"a*my (?), n. [Gr. xe`nos strange, foreign + ga`mos marriage.] (Bot.) Cross fertilization.
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Xenogenesis
Xen`o*gen"e*sis (?), n. [Gr. xe`nos a stranger + E. genesis.] (Biol.) (a) Same as Heterogenesis. (b) The fancied production of an organism of one kind by an organism of another. Huxley.
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Xenogenetic
Xen`o*ge*net"ic (?), a. (Biol.) Of or pertaining to xenogenesis; as, the xenogenetic origin of microzymes. Huxley.
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Xenomania
Xen`o*ma"ni*a (?), n. [Gr. xe`nos strange + E. mania.] A mania for, or an inordinate attachment to, foreign customs, institutions, manners, fashions, etc. [R.] Saintsbury.
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Xenomi
Xen"o*mi (?), prop. n. pl. [NL., from Gr. xe`nos strange.] (Zool.) A suborder of soft-rayed fresh-water fishes of which the blackfish of Alaska (Dallia pectoralis) is the type.
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Xenopterygii
Xe*nop`te*ryg"i*i (?), prop. n. pl. [NL., from Gr. xe`nos strange + &unr_;, dim. of &unr_; a wing.] (Zool.) A suborder of fishes including Gobiesox and allied genera. These fishes have soft-rayed fins, and a ventral sucker supported in front by the pectoral fins. They are destitute of scales.
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Xenotime
Xen"o*time (?), n. [Gr. xeno`timos honoring guests or strangers; xe`nos guest, stranger + timh` honor: cf. G. xenotim.] (Min.) A native phosphate of yttrium occurring in yellowish-brown tetragonal crystals.
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Xenurine
Xe*nu"rine (?), n. [Gr. xe`nos strange + o'yra` tail.] (Zool.) A cabassou.
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Xenyl
Xen"yl (?), n. [Gr. xe`nos strange + -yl.] (Chem.) The radical characteristic of xenylic compounds.
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Xenylic
Xe*nyl"ic (?), a. (Chem.) Pertaining to, derived from, designating, certain amido compounds obtained by reducing certain nitro derivatives of diphenyl.
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Xeraphim
Xer"a*phim (?), n. [Pg. xarafin, xerafin, fr. Ar. ashrafī noble, the name of a gold coin.] An old money of account in Bombay, equal to three fifths of a rupee.
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Xeres
Xer"es (?), n. Sherry. See Sherry.
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Xerif
Xer"if (z&ebreve_;r"&ibreve_;f), n. A shereef.
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Xeriff
Xer"iff (z&ebreve_;r"&ibreve_;f), n. [See Shereef.] A gold coin formerly current in Egypt and Turkey, of the value of about 9s. 6d., or about $2.30 (ca. 1900); -- also, in Morocco, a ducat.
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Xeroderma
Xe`ro*der"ma (?), n. [NL., fr. Gr. xhro`s dry + de`rma skin.] (Med.) (a) Ichthyosis. (b) A skin disease characterized by the presence of numerous small pigmented spots resembling freckles, with which are subsequently mingled spots of atrophied skin.
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Xeronate
Xe"ro*nate (?), n. (Chem.) A salt of xeronic acid.
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Xeronic
Xe*ron"ic (?), a. [Gr. xhro`s dry + citraconic.] (Chem.) Pertaining to, or designating, an acid, C8H12O4, related to fumaric acid, and obtained from citraconic acid as an oily substance having a bittersweet taste; -- so called from its tendency to form its anhydride.
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Xerophagy
Xe*roph"a*gy (?), n. [L. xerophagia, Gr. &unr_;; xhro`s dry + &unr_; to eat.] Among the primitive Christians, the living on a diet of dry food in Lent and on other fasts.
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Xerophilous
Xe*roph"i*lous (?), a. [Gr. xhro`s dry + &unr_; to love.] (Bot.) Drought-loving; able withstand the absence or lack of moisture.
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Plants which are peculiarly adapted to dry climates are termed by De Candolle xerophilous. Goodale.
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Xerophthalmia
Xe`roph*thal"mi*a (?), n. [L., fr. Gr. &unr_;; xhro`s dry + &unr_; the eye. See Ophthalmia.] (Med.) An abnormal dryness of the eyeball produced usually by long-continued inflammation and subsequent atrophy of the conjunctiva.
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Xerophthalmy
Xe`roph*thal"my (?), n. (Med.) Xerophthalmia.
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Xerophyllum
Xe*ro"phyl*lum (?), pr. n. A small genus of North American herbs having grasslike basal leaves: squaw grass; sometimes placed in family Melanthiaceae.
Syn. -- genus Xerophyllum.
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xerophyte
xe"ro*phyte (?), n. A plant adapted for life with a limited supply of water; compare hydrophyte and mesophyte.
Syn. -- desert plant, xerophytic plant, xerophile, xerophilous plant.
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xerophytic
xe`ro*phy"tic (?), adj. 1. (Botany) [Gr. xhro`s dry + fyto`n a plant.] Adapted to a xeric (or dry) environment; as, cacti are xerophytic plants; xerophytic adaptations.
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Xerox
Xe"rox (?), n. [From a brand name of the Xerox corporation.] A copying machine which copies graphic matter by the action of light on an electrically charged photoconductive insulating surface in which the latent image is developed with a resinous powder.
Syn. -- xerox, xerographic copier, xerox machine.
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2. A copy made by the xerox process.
Syn. -- xerox copy.
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xerox
xe"rox (?), v. t. To copy a printed document on a xerographic device.
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xi
xi (?), adj. The Roman number symbolizing the value eleven. Used after a noun it may symbolize the ordinal number; as, Superbowl XI.
Syn. -- eleven, 11.
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Xian
Xi"an (?), pr. n. The capital of the ancient Chinese empire.
Syn. -- Sian, Singan, Changan.
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xii
xii (?), adj. The Roman number symbolizing the value twelve; denoting a quantity consisting of 12 items or units. Used after a noun it may symbolize the ordinal number; as, Superbowl XII.
Syn. -- twelve, 12, dozen.
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xiii
xiii (?), adj. 1. the Roman number symbolizing the value thirteen. Used after a noun it may symbolize the ordinal number; as, Superbowl XIII.
Syn. -- thirteen, 13.
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Xiphias
Xiph"i*as (?), prop. n. [L., a swordfish, a sword-shaped comet, fr. Gr. xifi`as, fr. xi`fos a sword.] 1. (Zool.) A genus of fishes comprising the common swordfish.
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2. (Anat.) (a) The constellation Dorado. (b) A comet shaped like a sword
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Xiphidium
Xi*phid"i*um (?), prop. n. [NL., from Gr. &unr_;, dim. of xi`fos sword.] (Bot.) A genus of plants of the order Haemodraceae, having two-ranked, sword-shaped leaves.
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Xiphioid
Xiph"i*oid (?), a. [Xiphius + -oid.] (Zool.) Of, pertaining to, or resembling, a cetacean of the genus Xiphius or family Xiphiidae.
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Xiphiplastron
Xiph"i*plas"tron (?), n.; pl. Xiphiplastra (?). [NL., fr. Gr. xi`fos a sword + plastron.] (Anat.) The posterior, or fourth, lateral plate in the plastron of turtles; -- called also xiphisternum.
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Xiphisternum
Xiph"i*ster"num (?), n.; pl. Xiphisterna (?). [NL., fr. Gr. xi`fos a sword + sternum.] (Anat.) (a) The posterior segment, or extremity, of the sternum; -- sometimes called metasternum, ensiform cartilage, ensiform process, or xiphoid process. (b) The xiphiplastron. -- Xiph"i*ster"nal (?) a.
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Xiphius
Xiph"i*us (?), n. [NL., fr. Gr. xi`fos a sword.] (Zool.) A genus of cetaceans having a long, pointed, bony beak, usually two tusklike teeth in the lower jaw, but no teeth in the upper jaw.
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Xiphodon
Xiph"o*don (?), n. [Gr. xi`fos a sword + 'odoy`s, 'odo`ntos, a tooth.] (Paleon.) An extinct genus of artiodactylous mammals found in the European Tertiary formations. It had slender legs, didactylous feet, and small canine teeth.
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Xiphoid
Xiph"oid (?; 277), a. [Gr. xifoeidh`s sword-shaped; xi`fos a sword + e`i^dos form, shape: cf. F. xiphoide.] (Anat.) (a) Like a sword; ensiform. (b) Of or pertaining to the xiphoid process; xiphoidian.
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Xiphoidian
Xiph*oid"i*an (?), a. (Anat.) Xiphoid.
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Xiphophyllous
Xi*phoph"yl*lous (?), a. [Gr. xi`fos sword + fy`llon leaf.] (Bot.) Having sword-shaped leaves.
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Xiphosura
Xiph`o*su"ra (?), n. pl. See Xiphura.
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Xiphura
Xi*phu"ra (?), n. pl. [NL., from Gr. xi`fos sword + o'yra` tail.] (Zool.) Same as Limuloidea. Called also Xiphosura.
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xl
xl (?), adj. 1. the Roman number symbolizing the value forty.
Syn. -- forty, 40, twoscore.
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Xmas
X"mas (?), n. Christmas; -- an abbreviation for the Christian holiday celebrating the birth of Christ; a quarter day in England, Wales, and Ireland.
Syn. -- Christmas, Christmas Day, Dec 25.
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XP
XP (?). [Belongs here in appearance only.] The first two letters of the Greek word CHRISTOS, Christ; -- an abbreviation used with the letters separate or, oftener, in a monogram, often inclosed in a circle, as a symbol or emblem of Christ. It use as an emblem was introduced by Constantine the Great, whence it is known as the Constantinian symbol, or monogram. See Labarum.
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x-rated
x"-rat`ed (&ebreve_;ks"rāt`&ebreve_;d), a. [from a system of ratings for movies based on objectionableness of the content or suitability for children.] having a rating of X; not suitable for children; broadly, obscene or sexually explicit.
[PJC]

X-ray
X ray
X ray, X-ray (&ebreve_;ks"rā`), n. [so called by its discoverer because of its enigmatical character, x being an algebraic symbol for an unknown quantity.] (Physics) Originally, any of the rays produced when cathode rays strike upon surface of a solid (as a copper target or the wall of the vacuum tube); now defined as electromagnetic radiation with a wavelength of 0.1 to 10 nanometers. X-rays are noted for their penetration of many opaque substances, as wood and flesh, their action on photographic plates, and their fluorescent effects. They were called X rays by their discoverer, W. K. Röntgen, but were also referred to for some time as Roentgen rays. The term X-ray has become the most common designation. They also ionize gases, but cannot be reflected, or polarized, or deflected by a magnetic field. They are used in examining objects opaque to visible light, as for imaging bones or other structures inside the human body, and for detecting flaws in metal objects, such as in welds.
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X-ray
X ray
X ray, X-ray (&ebreve_;ks"rā`), v. t. To examine by means of X-rays; to irradiate with X-rays.
[PJC]

X-ray astronomy
X"-ray` astronomy. The branch of astronomy dealing with the study of astronomical objects which emit X-rays, and the methods used to detect such objects.
[PJC]

X-ray tube
X"-ray` tube. (Physics) A vacuum tube suitable for producing Roentgen rays.
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XT
XT (?), n. (Electronics) An abbreviation for crosstalk, the presence of an unwanted signal via an accidental coupling. [abbrev.]
Syn. -- crosstalk.
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xv
xv (?), adj. The Roman number symbolizing the value fifteen.
Syn. -- fifteen, 15.
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xvi
xvi (?), adj. The Roman number symbolizing the value sixteen.
Syn. -- sixteen, 16.
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xvii
xvii (?), adj. The Roman number symbolizing the value seventeen.
Syn. -- seventeen, 17.
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xviii
xviii (?), adj. The Roman number symbolizing the value eighteen.
Syn. -- eighteen, 18.
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xx
xx (?), adj. The Roman number representing twenty; denoting a quantity consisting of 20 items or units.
Syn. -- twenty, 20, score.
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xxi
xxi (?), adj. The Roman number representing twenty-one.
Syn. -- twenty-one, 21.
[WordNet 1.5]

xxii
xxii (?), adj. The Roman number representing twenty-two.
Syn. -- twenty-two, 22.
[WordNet 1.5]

xxiii
xxiii (?), adj. The Roman number representing twenty-three.
Syn. -- twenty-three, 23.
[WordNet 1.5]

xxiv
xxiv (?), adj. The Roman number representing twenty-four.
Syn. -- twenty-four, 24.
[WordNet 1.5]

xxix
xxix (?), adj. The Roman number representing twenty-nine.
Syn. -- twenty-nine, 29.
[WordNet 1.5]

xxv
xxv (?), adj. The Roman number representing twenty-five.
Syn. -- twenty-five, 25.
[WordNet 1.5]

xxvi
xxvi (?), adj. The Roman number representing twenty-six.
Syn. -- twenty-six, 26.
[WordNet 1.5]

xxvii
xxvii (?), adj. The Roman number representing twenty-seven.
Syn. -- twenty-seven, 27.
[WordNet 1.5]

xxviii
xxviii (?), adj. The Roman number representing twenty-eight.
Syn. -- twenty-eight, 28.
[WordNet 1.5]

xxx
xxx (?), adj. The Roman number representing thirty; -- in the postposition, designating the thirtieth in a series.
Syn. -- thirty, 30.
[WordNet 1.5]

xxx
xxx (?), adj. [by reduplication of the "X" used in some movie-rating systems.] Very obscene or pornographic.
Syn. -- X-rated, obscene, pornographic.
[WordNet 1.5]

Xylamide
Xy*lam"ide (?), n. [Xylic + amide.] (Chem.) An acid amide derivative of xylic acid, obtained as a white crystalline substance.
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Xylan
Xy"lan (?), n. (Chem.) A gummy substance of the pentosan class, present in woody tissue, and yielding xylose on hydrolysis; wood gum.
[Webster 1913 Suppl.]

Xylanthrax
Xy*lan"thrax (?), n. [Gr. xy`lon wood + 'a`nqrax coal.] Wood coal, or charcoal; -- so called in distinction from mineral coal.
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Xylaria
Xy*la"ria (?), pr. n. The type genus of the natural family Xylariaceae; fungi with perithecia in the upper part of erect black woody stromata.
Syn. -- genus Xylaria.
[WordNet 1.5]

Xylariaceae
Xy*la'ri*a"ce*ae pr. n. A natural family of fungi characterized by dark brown to back spores.
Syn. -- family Xylariaceae.
[WordNet 1.5]

Xylate
Xy"late (?), n. (Chem.) A salt of xylic acid.
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Xylem
Xy"lem (?), n. [Gr. xy`lon wood.] (Bot.) That portion of a fibrovascular bundle which has developed, or will develop, into wood cells; -- distinguished from phloem.
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Xylene
Xy"lene (?), n. [Gr. xy`lon wood.] (Chem.) Any of a group of three metameric hydrocarbons of the aromatic series, found in coal and wood tar, and so named because found in crude wood spirit. They are colorless, oily, inflammable liquids, C6H4.(CH3)2, being dimethyl benzenes, and are called respectively orthoxylene, metaxylene, and paraxylene. Called also xylol.
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&hand_; Each of these xylenes is the nucleus and prototype of a distinct series of compounds.
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Xylenol
Xy"le*nol (?), n. [Xylene + -ol.] (Chem.) Any one of six metameric phenol derivatives of xylene, obtained as crystalline substances, (CH3)2.C6H3.OH.
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Xyletic
Xy*let"ic (?), a. (Chem.) Pertaining to, or designating, a complex acid related to mesitylenic acid, obtained as a white crystalline substance by the action of sodium and carbon dioxide on crude xylenol.
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Xylic
Xy"lic (?), a. (Chem.) Pertaining to, derived from, or related to, xylene; specifically, designating any one of several metameric acids produced by the partial oxidation of mesitylene and pseudo-cumene.
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Xylidic
Xy*lid"ic (?), a. (Chem.) Pertaining to, or designating, either one of two distinct acids which are derived from xylic acid and related compounds, and are metameric with uvitic acid.
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Xylidine
Xy"li*dine (?), n. (Chem.) Any one of six metameric hydrocarbons, (CH3)2.C6H3.NH2, resembling aniline, and related to xylene. They are liquids, or easily fusible crystalline substances, of which three are derived from metaxylene, two from orthoxylene, and one from paraxylene. They are called the amido xylenes.
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&hand_; The xylidine of commerce, used in making certain dyes, consists chiefly of the derivatives of paraxylene and metaxylene.
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Xylindein
Xy*lin"de*in (?), n. (Chem.) A green or blue pigment produced by Peziza in certain kinds of decayed wood, as the beech, oak, birch, etc., and extracted as an amorphous powder resembling indigo.
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Xylite
Xy"lite (?), n. [Gr. xy`lon wood.] (Chem.) A liquid hydrocarbon found in crude wood spirits.
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Xylitone
Xy"li*tone (?), n. (Chem.) A yellow oil having a geraniumlike odor, produced as a side product in making phorone; -- called also xylite oil.
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Xylo-
Xy"lo- (?). A combining form from Gr. xy`lon wood; as in xylogen, xylograph.
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Xylobalsamum
Xy`lo*bal"sa*mum (?), n. [NL., fr. Gr. xy`lon wood + ba`lsamon the balsam tree, balsam; cf. L. xylobalsamum balsam wood, Gr. xyloba`lsamon.] (Med.) The dried twigs of a Syrian tree (Balsamodendron Gileadense). U. S. Disp.
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Xylocarpous
Xy`lo*car"pous (?), a. [Xylo- + Gr. karpo`s fruit.] (Bot.) Bearing fruit which becomes hard or woody.
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Xylocopa
Xy*loc"o*pa (?), n. [NL., fr. Gr. &unr_; cutting wood; xy`lon wood + &unr_; to cut.] (Zool.) A genus of hymenopterous insects including the carpenter. See Carpenter bee, under Carpenter. -- Xy*loc"o*pine (?), a.
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Xylogen
Xy"lo*gen (?), n. [Xylo- + -gen.] (a) (Bot.) Nascent wood; wood cells in a forming state. (b) Lignin.
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Xylograph
Xy"lo*graph (?), n. [Xylo- + -graph.] An engraving on wood, or the impression from such an engraving; a print by xylography.
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Xylographer
Xy*log"ra*pher (?), n. One who practices xylography.
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Xylographical
Xylographic
{ Xy`lo*graph"ic (?), Xy`lo*graph"ic*al (?), } a. [Cf. F. xylographique.] Of or pertaining to xylography, or wood engraving.
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Xylography
Xy*log"ra*phy (?), n. [Xylo- + -graphy: cf. F. xylographie.]
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1. The art of engraving on wood.
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2. The art of making prints from the natural grain of wood. Knight.
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3. A method pf printing in colors upon wood for purposes of house decoration. Ure.
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Xyloid
Xy"loid (?), a. [Xylo- + -oid.] Resembling wood; having the nature of wood.
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Xyloidin
Xy*loid"in (?), n. [Xylo- + -oid.] (Chem.) A substance resembling pyroxylin, obtained by the action of nitric acid on starch; -- called also nitramidin.
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Xylol
Xy"lol (?), n. [Xylo- + L. oleum oil.] (Chem.) Same as Xylene.
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Xylology
Xy*lol"o*gy (?), n. [Pref. xylo- + -logy.] The branch of dendrology treating of the gross and minute structure of wood.
[Webster 1913 Suppl.]

Xylonite
Xy"lon*ite (?), n. See Zylonite.
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Xylophaga
Xy*loph"a*ga (?), prop. n. [NL. See Xylophagous.] (Zool.) A genus of marine bivalves which bore holes in wood. They are allied to Pholas.
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Xylophagan
Xy*loph"a*gan (?), n. [See Xylophagous.] (Zool.) (a) One of a tribe of beetles whose larvae bore or live in wood. (b) Any species of Xylophaga. (c) Any one of the Xylophagides.
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Xylophagides
Xy`lo*phag"i*des (?), prop. n. pl. [See Xylophagous.] (Zool.) A tribe or family of dipterous flies whose larvae live in decayed wood. Some of the tropical species are very large.
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Xylophagous
Xy*loph"a*gous (?), a. [Gr. xylofa`gos eating wood; xy`lon wood + fagei^n to eat.] (Zool.) (a) Eating, boring in, or destroying, wood; -- said especially of certain insect larvae, crustaceans, and mollusks. (b) Of or pertaining to the genus Xylophaga.
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Xylophilan
Xy*loph"i*lan (?), n. [See Xylophilous.] (Zool.) One of a tribe of beetles (Xylophili) whose larvae live on decayed wood.
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Xylophilous
Xy*loph"i*lous (?), a. [Xylo- + Gr. filei^n to love.] (Zool.) Of or pertaining to the xylophilans.
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Xylophone
Xy"lo*phone (?), n. [Xylo- + Gr. fwnh` sound.]
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1. (Mus.) Originally, an instrument common among the Russians, Poles, and Tartars, consisting of a series of strips of wood or glass graduated in length to the musical scale, resting on belts of straw, and struck with two small hammers; now any similar musical instrument composed of a series of bars of graduated length. Called in Germany strohfiedel, or straw fiddle.
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2. An instrument to determine the vibrative properties of different kinds of wood. Knight.
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Xyloplastic
Xy`lo*plas"tic (?), a. [Xylo- + -plastic.] (Technol.) Formed of wood pulp by molds; relating to casts made of wood pulp in molds.
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Xylopyrography
Xy`lo*py*rog"ra*phy (?). n. [Xylo- + Gr. &unr_;, &unr_;, fire + -graphy.] The art or practice of burning pictures on wood with a hot iron; -- called also wood burning and poker painting. See Poker picture, under Poker.
[1913 Webster + PJC]


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Xyloquinone
Xy`lo*qui"none (?), n. [Xylene + quinone.] (Chem.) Any one of a group of quinone compounds obtained respectively by the oxidation of certain xylidine compounds. In general they are yellow crystalline substances.
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Xylorcin
Xy*lor"cin (?), n. [Xylene + orcin.] (Chem.) A derivative of xylene obtained as a white crystalline substance which on exposure in the air becomes red; -- called also betaorcin.
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Xylose
Xy"lose (?), n. [Pref. xylo- + -ose.] (Chem.) An unfermentable sugar of the pentose class, C5H10O5, formed by the hydrolysis of xylan; wood sugar.
[Webster 1913 Suppl.]

Xylostein
Xy*los"te*in (?), n. [Xylo- + Gr. 'oste`on bone.] (Chem.) A glucoside found in the poisonous berries of a species of honeysuckle (Lonicera xylosteum), and extracted as a bitter, white, crystalline substance.
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Xylotile
Xy"lo*tile (?), n. Same as Parkesine.
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Xylotomist
Xy*lot"o*mist (?), n. One versed or engaged in xylotomy.
[Webster 1913 Suppl.]

Xylotomous
Xy*lot"o*mous (?), a. [Pref. xylo- + root of Gr. te`mnein to cut.] (Zool.) Capable of boring or cutting wood; -- said of many insects.
[Webster 1913 Suppl.]

Xylotomy
Xy*lot"o*my (?), n. [Pref. xylo- + -tomy.] Art of preparing sections (transverse, tangential, or radial) of wood, esp. by means of a microtome, for microscopic examination.
[Webster 1913 Suppl.]

Xylotrya
Xy*lo"try*a (?), n. [NL., fr. Gr. xy`lon wood + &unr_; to rub, wear out.] (Zool.) A genus of marine bivalves closely allied to Teredo, and equally destructive to timber. One species (Xylotrya fimbriata) is very common on the Atlantic coast of the United States.
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Xylyl
Xy"lyl (?), n. [Xylo- + -yl.] (Chem.) Any one of three metameric radicals which are characteristic respectively of the three xylenes.
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Xylylene
Xy"lyl*ene (?), n. (Chem.) Any one of three metameric radicals, CH2.C6H4.CH2, derived respectively from the three xylenes. Often used adjectively; as, xylylene alcohol.
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Xyridaceous
Xyr`i*da"ceous (?), a. (Bot.) Of or pertaining to a natural order (Xyrideae) of endogenous plants, of which Xyris is the type.
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Xyris
Xy"ris (?), n. [L., a kind of Iris, Gr. &unr_;, fr. &unr_; a razor.] (Bot.) A genus of endogenous herbs with grassy leaves and small yellow flowers in short, scaly-bracted spikes; yellow-eyed grass. There are about seventeen species in the Atlantic United States.
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Xystus
Xyst
{ Xyst (?), ‖Xys"tus (?), } n. [L. xystus, Gr. &unr_;, from &unr_; to scrape, polish; -- so called from its smooth and polished floor.] (Anc. Arch.) A long and open portico, for athletic exercises, as wrestling, running, etc., for use in winter or in stormy weather.
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Xystarch
Xyst"arch (?), n. [L. xystarches, Gr. &unr_;, &unr_; a xyst + &unr_; to rule.] (Gr. Antiq.) An officer having the superintendence of the xyst. Dr. W. Smith.
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Xyster
Xys"ter (?), n. [NL., fr. Gr. xysth`r a scraper.] (Surg.) An instrument for scraping bones.
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