Hydramine
(Hy*dram"ine) n. [Hydroxyl + amine.] (Chem.) One of a series of artificial, organic bases,
usually produced as thick viscous liquids by the action of ammonia on ethylene oxide. They have the
properties both of alcohol and amines.
Hydrangea
(Hy*dran"ge*a) n. [NL., fr. Gr. "y`dwr water + vessel, capsule: cf. F. hydrangée.] (Bot.) A
genus of shrubby plants bearing opposite leaves and large heads of showy flowers, white, or of various
colors. H. hortensis, the common garden species, is a native of China or Japan.
Hydrant
(Hy"drant) n. [Gr. to irrigate, fr. "y`dwr water. See Hydra.] A discharge pipe with a valve
and spout at which water may be drawn from the mains of waterworks; a water plug.
Hydranth
(Hy"dranth) n. [Hydra + Gr. a flower.] (Zoöl.) One of the nutritive zooids of a hydroid colony.
Also applied to the proboscis or manubrium of a hydroid medusa. See Illust. of Hydroidea.
Hydrargochloride
(Hy*drar"go*chlo"ride) n. [Hydrargyrum + chloride.] (Chem.) A compound of the
bichloride of mercury with another chloride. [Obs.]
Hydrargyrate
(Hy*drar"gy*rate) a. Of or pertaining to mercury; containing, or impregnated with, mercury.
[R.]
Hydrargyrism
(Hy*drar"gy*rism) n. (Med.) A diseased condition produced by poisoning with hydrargyrum,
or mercury; mercurialism.
Hydrargyrum
(Hy*drar"gy*rum) n. [NL., fr. L. hydrargyrus, Gr. "ydra`rgyros; "y`dwr water + 'a`rgyros
silver.] (Chem.) Quicksilver; mercury.
Hydrarthrosis
(||Hy`drar*thro"sis) n. [NL. See Hydro-, 1, and Arthrosis.] (Med.) An effusion of watery
liquid into the cavity of a joint.
Hydrastine
(Hy*dras"tine) n. (Chem.) An alkaloid, found in the rootstock of the golden seal and extracted
as a bitter, white, crystalline substance. It is used as a tonic and febrifuge.
Hydra-tainted
(Hy"dra-taint`ed) a. Dipped in the gall of the fabulous hydra; poisonous; deadly. Cowper.
Hydrate
(Hy"drate) n. [Gr. "y`dwr water: cf. F. hydrate.] (Chem.) (a) A compound formed by the
union of water with some other substance, generally forming a neutral body, as certain crystallized salts.
(b) A substance which does not contain water as such, but has its constituents (hydrogen, oxygen, hydroxyl)
so arranged that water may be eliminated; hence, a derivative of, or compound with, hydroxyl; hydroxide; as,
ethyl hydrate, or common alcohol; calcium hydrate, or slaked lime.
Hydrate
(Hy"drate) v. t. [imp. & p. p. Hydrated ; p. pr. & vb. n. Hydrating ] To form into a hydrate; to
combine with water.
