Hydrous
(Hy"drous) a. [Gr. "y`dwr water.]
1. Containing water; watery.
2. (Chem.) Containing water of hydration or crystallization.
Hydroxanthane
(Hy`dro*xan"thane) n. (Chem.) A persulphocyanate. [Obs.]
Hydroxanthic
(Hy`dro*xan"thic) a. [Hydro-, 2 + xanthic.] (Chem.) Persulphocyanic.
Hydroxide
(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.
Hydroxy-
(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.
Hydroxyl
(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.
Hydroxylamine
(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.
Hydrozoa
(||Hy`dro*zo"a) n. pl. [NL., fr. E. hydra + Gr. an animal.] (Zoöl.) The Acalephæ; one of the
classes of cœlenterates, including the Hydroidea, Discophora, and Siphonophora.
Hydrozoal
(Hy`dro*zo"al) a. (Zoöl.) Of or pertaining to the Hydrozoa.
Hydrozoön
(||Hy`dro*zo"ön) n.; pl. L. Hydrozoa E. Hydrozoöns [NL.] (Zoöl.) One of the Hydrozoa.
Hydruret
(Hy"dru*ret) n. [Hydro-, 2] (Chem.) A binary compound of hydrogen; a hydride. [Obs.]
