Webster's Dictionary, 1913

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X-ray tube (Physics) A vacuum tube suitable for producing Röntgen rays.

Xenomania noun [ Greek xe`nos strange + English mania .] A mania for, or an inordinate attachment to, foreign customs, institutions, manners, fashions, etc. [ R.] Saintsbury.

Xenomi noun plural [ New Latin , from Greek xe`nos strange.] (Zoology) A suborder of soft-rayed fresh-water fishes of which the blackfish of Alaska ( Dallia pectoralis ) is the type.

Xenon noun [ Greek ..., neut. of ... strange.] (Chemistry) A very heavy, inert gaseous element 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 -109° C., and to a solid which volatilizes without melting. Symbol Xe or X ; atomic weight 130.2.

Xenopterygii noun plural [ New Latin , from Greek xe`nos strange + ..., dim. of ... a wing.] (Zoology) 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.

Xenotime noun [ Greek ... honoring guests or strangers; xe`nos guest, stranger + ... honor: confer German xenotim .] (Min.) A native phosphate of yttrium occurring in yellowish-brown tetragonal crystals.

Xenurine noun [ Greek xe`nos strange + ... tail.] (Zoology) A cabassou.

Xenyl noun [ Greek xe`nos strange + -yl .] (Chemistry) The radical characteristic of xenylic compounds.

Xenylic adjective (Chemistry) Pertaining to, derived from, designating, certain amido compounds obtained by reducing certain nitro derivatives of diphenyl.

Xeraphim noun [ Portuguese xarafin , xerafin , from Arabic ashrafī noble, the name of a gold coin.] An old money of account in Bombay, equal to three fifths of a rupee.

Xeres noun Sherry. See Sherry .

Xerif noun A shereef.

Xeriff noun [ See Shereef .] A gold coin formerly current in Egypt and Turkey, of the value of about 9s. 6d., or about $2.30; -- also, in Morocco, a ducat.

Xeroderma noun [ New Latin , from Greek ... dry + ... skin.] (Medicine) (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.

Xeronate noun (Chemistry) A salt of xeronic acid.

Xeronic adjective [ Greek ... dry + citra conic .] (Chemistry) Pertaining to, or designating, an acid, C 8 H 12 O 4 , 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.

Xerophagy noun [ Latin xerophagia , Greek ...; ... dry + ... to eat.] Among the primitive Christians, the living on a diet of dry food in Lent and on other fasts.

Xerophilous adjective [ Greek ... dry + ... to love.] (Botany) Drought-loving; able withstand the absence or lack of moisture.

Plants which are peculiarly adapted to dry climates are termed by De Candolle xerophilous .

Xerophthalmia noun [ Latin , from Greek ...; ... dry + ... the eye. See Ophthalmia .] (Medicine) An abnormal dryness of the eyeball produced usually by long- continued inflammation and subsequent atrophy of the conjunctiva.

Xerophthalmy noun (Medicine) Xerophthalmia.

Xiphias noun [ Latin , a swordfish, a sword-shaped comet, from Greek xifi`as , from xi`fos a sword.]

1. (Zoology) A genus of fishes comprising the common swordfish.

2. (Anat.) (a) The constellation Dorado. (b) A comet shaped like a sword

Xiphidium noun [ New Latin , from Greek ..., dim. of xi`fos sword.] (Botany) A genus of plants of the order Hæmodraceæ , having two-ranked, sword-shaped leaves.

Xiphioid adjective [ Xiphius + -oid .] (Zoology) Of, pertaining to, or resembling, a cetacean of the genus Xiphius or family Xiphiidæ .

Xiphiplastron noun ; plural Xiphiplastra . [ New Latin , from Greek xi`fos a sword + plastron .] (Anat.) The posterior, or fourth, lateral plate in the plastron of turtles; -- called also xiphisternum .

Xiphisternum noun ; plural Xiphisterna . [ New Latin , from Greek 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 adjective

Xiphius noun [ New Latin , from Greek xi`fos a sword.] (Zoology) 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.

Xiphodon noun [ Greek 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.

Xiphoid adjective [ Greek ... sword- shaped; xi`fos a sword + ... form, shape: confer French xiphoide .] (Anat.) (a) Like a sword; ensiform. (b) Of or pertaining to the xiphoid process; xiphoidian.

Xiphoidian adjective (Anat.) Xiphoid.

Xiphophyllous adjective [ Greek xi`fos sword + ... leaf.] (Botany) Having sword- shaped leaves.

Xiphosura noun plural See Xiphura .

Xiphura noun plural [ New Latin , from Greek xi`fos sword + ... tail.] (Zoology) Same as Limuloidea . Called also Xiphosura .

X ray . See under Ray .

XP [ Belongs here in appearance only.] The first two letters of the Greek word XRISTOS , 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 .

Xylamide noun [ Xyl ic + amide .] (Chemistry) An acid amide derivative of xylic acid, obtained as a white crystalline substance.

Xylan noun (Chemistry) A gummy substance of the pentosan class, present in woody tissue, and yielding xylose on hydrolysis; wood gum.

Xylanthrax noun [ Greek xy`lon wood + ... coal.] Wood coal, or charcoal; -- so called in distinction from mineral coal .

Xylate noun (Chemistry) A salt of xylic acid.

Xylem noun [ Greek xy`lon wood.] (Botany) That portion of a fibrovascular bundle which has developed, or will develop, into wood cells; -- distinguished from phloëm .

Xylene noun [ Greek xy`lon wood.] (Chemistry) 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, C 6 H 4 .(CH 3 ) 2 , being dimethyl benzenes, and are called respectively orthoxylene , metaxylene , and paraxylene . Called also xylol .

» Each of these xylenes is the nucleus and prototype of a distinct series of compounds.

Xylenol noun [ Xylene + - ol .] (Chemistry) Any one of six metameric phenol derivatives of xylene, obtained as crystalline substances, (CH 3 ) 2 .C 6 H 3 .OH.

Xyletic adjective (Chemistry) 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.

Xylic adjective (Chemistry) 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.

Xylidic adjective (Chemistry) 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.

Xylidine noun (Chemistry) Any one of six metameric hydrocarbons, (CH 3 ) 2 .C 6 H 3 .NH 2 , 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 .

» The xylidine of commerce, used in making certain dyes, consists chiefly of the derivatives of paraxylene and metaxylene.

Xylindein noun (Chemistry) 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.

Xylite noun [ Greek xy`lon wood.] (Chemistry) A liquid hydrocarbon found in crude wood spirits.

Xylitone noun (Chemistry) A yellow oil having a geraniumlike odor, produced as a side product in making phorone; -- called also xylite oil .

Xylo- A combining form from Greek xy`lon wood; as in xylo gen, xylo graph.

Xylobalsamum noun [ New Latin , from Greek xy`lon wood + ... the balsam tree, balsam; confer Latin xylobalsamum balsam wood, Greek ....] (Medicine) The dried twigs of a Syrian tree ( Balsamodendron Gileadense ). U. S. Disp.

Xylocarpous adjective [ Xylo- + Greek karpo`s fruit.] (Botany) Bearing fruit which becomes hard or woody.