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.