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.

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

(||Xi*phid"i*um) n. [NL., from Gr. dim. of xi`fos sword.] (Bot.) A genus of plants of the order Hæmodraceæ, having two-ranked, sword-shaped leaves.

(Xiph"i*oid) a. [Xiphius + -oid.] (Zoöl.) Of, pertaining to, or resembling, a cetacean of the genus Xiphius or family Xiphiidæ.

(||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.

(||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.

(||Xiph"i*us) n. [NL., fr. Gr. xi`fos a sword.] (Zoöl.) 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.

(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.

(Xiph"oid) 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.

  By PanEris using Melati.

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