Part 4

Xiph"oid (?; 277), a. [Gr. &?; sword- shaped; xi`fos a sword + &?; form, shape: cf. F. xiphoide.] (Anat.) (a) Like a sword; ensiform. (b) Of or pertaining to the xiphoid process; xiphoidian.

Xiph*oid"i*an (?), a. (Anat.) Xiphoid.

Xi*phoph"yl*lous (?), a. [Gr. xi`fos sword + &?; leaf.] (Bot.) Having sword- shaped leaves.

||Xiph`o*su"ra (?), n. pl. See Xiphura.

||Xi*phu"ra (?), n. pl. [NL., from Gr. xi`fos sword + &?; tail.] (Zoöl.) Same as Limuloidea. Called also Xiphosura.

X ray. See under Ray.

Xy*lam"ide (?), n. [Xylic + amide.] (Chem.) An acid amide derivative of xylic acid, obtained as a white crystalline substance.

Xy*lan"thrax (?), n. [Gr. xy`lon wood + &?; coal.] Wood coal, or charcoal; -- so called in distinction from mineral coal.

Xy"late (?), n. (Chem.) A salt of xylic acid.

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 phloëm.

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.

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

Xy"le*nol (?), n. [Xylene + - ol.] (Chem.) Any one of six metameric phenol derivatives of xylene, obtained as crystalline substances, (CH3)2.C6H3.OH.

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.

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.

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.

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.

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

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.

Xy"lite (?), n. [Gr. xy`lon wood.] (Chem.) A liquid hydrocarbon found in crude wood spirits.

Xy"li*tone (?), n. (Chem.) A yellow oil having a geraniumlike odor, produced as a side product in making phorone; -- called also xylite oil.

Xy"lo- (?). A combining form from Gr. xy`lon wood; as in xylogen, xylograph.

||Xy`lo*bal"sa*mum (?), n. [NL., fr. Gr. xy`lon wood + &?; the balsam tree, balsam; cf. L. xylobalsamum balsam wood, Gr. &?;.] (Med.) The dried twigs of a Syrian tree (Balsamodendron Gileadense). U. S. Disp.

Xy`lo*car"pous (?), a. [Xylo- + Gr. karpo`s fruit.] (Bot.) Bearing fruit which becomes hard or woody.

||Xy*loc"o*pa (?), n. [NL., fr. Gr. &?; cutting wood; xy`lon wood + &?; to cut.] (Zoöl.) A genus of hymenopterous insects including the carpenter. See Carpenter bee, under Carpenter. -- Xy*loc"o*pine (#), a.

Xy"lo*gen (?), n. [Xylo- + - gen.] (a) (Bot.) Nascent wood; wood cells in a forming state. (b) Lignin.

Xy"lo*graph (?), n. [Xylo- + - graph.] An engraving on wood, or the impression from such an engraving; a print by xylography.

Xy*log"ra*pher (?), n. One who practices xylography.