Hydropsy
(Hy"drop`sy) n. Same as Dropsy.
Hydropult
(Hy"dro*pult) n. [Hydro-, 1 + Gr. to hurl.] A machine for throwing water by hand power, as a
garden engine, a fire extinguisher, etc.
Hydroquinone
(Hy`dro*qui"none) n. [Hydro-, 2 + quinone.] (Chem.) A white crystalline substance,
C6H4(OH)2, obtained by the reduction of quinone. It is a diacid phenol, resembling, and metameric
with, pyrocatechin and resorcin. Called also dihydroxy benzene.
Hydrorhiza
(||Hy`dro*rhi"za) n.; pl. L. Hydrorhizæ E. Hydrorhizas [NL., fr. E. hydra + Gr. a root.] (Zoöl.)
The rootstock or decumbent stem by which a hydroid is attached to other objects. See Illust. under
Hydroidea.
Hydrosalt
(Hy"dro*salt`) n. [Hydro-, 1 + salt.] (Chem.) (a) A salt supposed to be formed by a hydracid
and a base. (b) An acid salt. [R.] (c) A hydrous salt; a salt combined with water of hydration or crystallization.
Hydroscope
(Hy"dro*scope) n. [Hydro-, 1 + -scope.]
1. An instrument designed to mark the presence of water, especially in air. Weale.
2. A kind of water clock, used anciently for measuring time, the water tricking from an orifice at the end
of a graduated tube.
Hydrosome
(Hy"dro*some ||Hy`dro*so"ma) , n. [NL. hydrosoma. See Hydra, and -some body.] (Zoöl.)
All the zooids of a hydroid colony collectively, including the nutritive and reproductive zooids, and often
other kinds.
Hydrosorbic
(Hy`dro*sor"bic) a. [Hydro-, 2 + sorbic.] (Chem.) Pertaining to, or designating, an acid
obtained from sorbic acid when this takes up hydrogen; as, hydrosorbic acid.
Hydrostat
(Hy"dro*stat) n. A contrivance or apparatus to prevent the explosion of steam boilers.
Hydrostatic
(Hy`dro*stat"ic Hy`dro*stat"ic*al) a. [Hydro-, 1 + Gr. causing to stand: cf. F. hydrostatique.
See Static.] Of or relating to hydrostatics; pertaining to, or in accordance with, the principles of the
equilibrium of fluids.
The first discovery made in hydrostatics since the time of Archimedes is due to Stevinus.
Hallam. Hydrostatic balance, a balance for weighing substances in water, for the purpose of ascertaining their
specific gravities. — Hydrostatic bed, a water bed. — Hydrostatic bellows, an apparatus consisting
of a water-tight bellowslike case with a long, upright tube, into which water may be poured to illustrate
the hydrostatic paradox. — Hydrostatic paradox, the proposition in hydrostatics that any quantity
of water, however small, may be made to counterbalance any weight, however great; or the law of the
equality of pressure of fluids in all directions. — Hydrostatic press, a machine in which great force,
with slow motion, is communicated to a large plunger by means of water forced into the cylinder in which
it moves, by a forcing pump of small diameter, to which the power is applied, the principle involved being
the same as in the hydrostatic bellows. Also called hydraulic press, and Bramah press. In the illustration,
a is a pump with a small plunger b, which forces the water into the cylinder c, thus driving upward the
large plunder d, which performs the reduced work, such as compressing cotton bales, etc.
Hydrostatically
(Hy`dro*stat"ic*al*ly), adv. According to hydrostatics, or to hydrostatic principles. Bentley.
Hydrostatician
(Hy`dro*sta*ti"cian) n. One who is versed or skilled in hydrostatics. [R.]
