Chapter Hydrated to Hydroidea of H by Webster's Dictionary (1913 Edition)

Hydria
(||Hy"dri*a) n. [L., fr. Gr. .] (Gr. Antiq.) A water jar; esp., one with a large rounded body, a small neck, and three handles. Some of the most beautiful Greek vases are of this form.

Hydriad
(Hy"dri*ad) n. [Gr. of the water, fr. "y`dwr water.] (Myth.) A water nymph.

Hydric
(Hy"dric) a. [From Hydrogen.] (Chem.) Pertaining to, or containing, hydrogen; as, hydric oxide.

Hydric dioxide. (Chem.) See Hydrogen dioxide, under Hydrogen. — Hydric oxide (Chem.), water. — Hydric sulphate (Chem.), hydrogen sulphate or sulphuric acid.

Hydride
(Hy"dride) n. [Hydr- + ide.] (Chem.) A compound of the binary type, in which hydrogen is united with some other element.

Hydriform
(Hy"dri*form) a. [Hydra + -form.] (Zoöl.) Having the form or structure of a hydra.

Hydrina
(||Hy*dri"na) n. pl. [NL. See Hydra.] (Zoöl.) The group of hydroids to which the fresh-water hydras belong.

Hydriodate
(Hy*dri"o*date) n. [Cf. F. hydriodate.] (Zoöl.) Same as Hydriodide.

Hydriodic
(Hy`dri*od"ic) a. [Hydr- + iodic: cf. F. hydriodique.] (Chem.) Pertaining to, or derived from, hydrogen and iodine; — said of an acid produced by the combination of these elements.

Hydriodic acid (Chem.), a pungent, colorless gas, HI, usually prepared as a solution in water. It is strong reducing agent. Called also hydrogen iodide.

Hydriodide
(Hy*dri"o*dide) n. (Chem.) A compound of hydriodic acid with a base; — distinguished from an iodide, in which only the iodine combines with the base.

Hydro-
(Hy"dro- Hy"dr-).

1. A combining form from Gr. water (see Hydra).

2. (Chem.) A combining form of hydrogen, indicating hydrogen as an ingredient, as hydrochloric; or a reduction product obtained by hydrogen, as hydroquinone.

Hydrobarometer
(Hy`dro*ba*rom"e*ter) n. [Hydro- , 1 + barometer.] An instrument for determining the depth of the sea water by its pressure.

Hydrobilirubin
(Hy`dro*bil`i*ru"bin) n. [Hydro- , 2 + bilirubin.] (Physiol. Chem.) A body formed from bilirubin, identical with urobilin.

Hydrobranchiata
(||Hy`dro*bran`chi*a"ta) n. pl. [NL., fr. Gr. "y`dwr water + gills.] (Zoöl.) An extensive artificial division of gastropod mollusks, including those that breathe by gills, as contrasted with the Pulmonifera. — Hy`dro*bran"chi*ate a.

Hydrobromate
(Hy`dro*bro"mate) n. (Chem.) Same as Hydrobromide.

Hydrobromic
(Hy`dro*bro"mic) a. [Hydro-, 2 + bromic.] (Chem.) Composed of hydrogen and bromine; as, hydrobromic acid.

Hydrobromic acid (Chem.), a colorless, pungent, corrosive gas, HBr, usually collected as a solution in water. It resembles hydrochloric acid, but is weaker and less stable. Called also hydrogen bromide.

Hydrobromide
(Hy`dro*bro"mide) n. (Chem.) A compound of hydrobromic acid with a base; — distinguished from a bromide, in which only the bromine unites with the base.