Chapter X to Xylitone of X by Webster's Dictionary (1913 Edition)

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

Xiphidium
(||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.

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

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.

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.

Xiphius
(||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.

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.

Xiphoid
(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.

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

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

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

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.

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

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

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

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 phloëm.

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.

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

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.