Part 956

Hy`dro*ther"a*py (?), n. [Hydro- , 1 + therapy.] (Med.) See Hydropathy.

Hy`dro*ther"mal (?), a. [Hydro-, 1 + thermal.] Of or pertaining to hot water; -- used esp. with reference to the action of heated waters in dissolving, redepositing, and otherwise producing mineral changes within the crust of the globe.

Hy`dro*tho"rax (?), n. [Hydro-, 1 + thorax.] (Med.) An accumulation of serous fluid in the cavity of the chest.

Hy*drot"ic (?), a. [Gr. "y`dwr water: cf. Gr. &?; moisture, F. hydrotique.] Causing a discharge of water or phlegm. -- n. (Med.) A hydrotic medicine.

Hy*drot"ic*al (?), a. Hydrotic.

Hy"dro*trope (?), n. [Hydro-, 1 + Gr. &?; to turn, direct.] A device for raising water by the direct action of steam; a pulsometer.

Hy`dro*trop"ic (?), a. [See Hydrotrope.] (Bot.) Turning or bending towards moisture, as roots.

Hy*drot"ro*pism (?), n. (Bot.) A tendency towards moisture.

Hy"drous (?), a. [Gr. "y`dwr water.] 1. Containing water; watery.

2. (Chem.) Containing water of hydration or crystallization.

Hy`dro*xan"thane (?), n. (Chem.) A persulphocyanate. [Obs.]

Hy`dro*xan"thic (?), a. [Hydro-, 2 + xanthic.] (Chem.) Persulphocyanic.

Hy*drox"ide (?), n. [Hydro-, 2 + oxide.] (Chem.) A hydrate; a substance containing hydrogen and oxygen, made by combining water with an oxide, and yielding water by elimination. The hydroxides are regarded as compounds of hydroxyl, united usually with basic element or radical; as, calcium hydroxide ethyl hydroxide.

Hy*drox"y- (?). (Chem.) A combining form, also used adjectively, indicating hydroxyl as an ingredient.

Hydroxy acid (Chem.), an organic acid, having (besides the hydroxyl group of the carboxyl radical) an alcoholic hydroxyl group, and thus having the qualities of an alcohol in addition to its acid properties; as, lactic and tartaric acids are hydroxy acids.

Hy*drox"yl (?), n. [Hydro-, 2 + oxygen + -yl.] (Chem.) A compound radical, or unsaturated group, HO, consisting of one atom of hydrogen and one of oxygen. It is a characteristic part of the hydrates, the alcohols, the oxygen acids, etc.

Hy*drox`yl*am"ine (?), n. [Hydroxyl + amine.] (Chem.) A nitrogenous, organic base, NH2.OH, resembling ammonia, and produced by a modified reduction of nitric acid. It is usually obtained as a volatile, unstable solution in water. It acts as a strong reducing agent.

||Hy`dro*zo"a (?), n. pl. [NL., fr. E. hydra + Gr. &?; an animal.] ||(Zoˆl.) The AcalephÊ; one of the classes of cúlenterates, including ||the Hydroidea, Discophora, and Siphonophora.

Hy`dro*zo"al (?), a. (Zoˆl.) Of or pertaining to the Hydrozoa.

||Hy`dro*zo"ˆn (?), n.; pl. L. Hydrozoa (#), E. Hydrozoˆns (#). [NL.] ||(Zoˆl.) One of the Hydrozoa.

Hy"dru*ret (?), n. [Hydro-, 2] (Chem.) A binary compound of hydrogen; a hydride. [Obs.]

||Hy"drus (?), n. [L., a water serpent; also, a certain constellation, ||Gr. "y`dros.] (Astron.) A constellation of the southern hemisphere, ||near the south pole.

Hye (?), n. & v. See Hie. [Obs.] Chaucer.

Hy*e"mal (?), a. [L. hyemalis, or better hiemalis, fr. hyems, hiems, winter: cf. F. hyÈmal.] Belonging to winter; done in winter. Sir T. Browne.

Hy"e*mate (?), v. i. [L. hiemare, hiematum. See Hyemal.] To pass the winter. [Obs. & R.]

Hy`e*ma"tion (?), n. [L. hiematio.] 1. The passing of a winter in a particular place; a wintering.

2. The act of affording shelter in winter. [Obs.]

Hy"en (?), n. [F. hyËne.] A hyena. [Obs.] Shak.