Webster's Dictionary, 1913

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Hydra-tainted adjective Dipped in the gall of the fabulous hydra; poisonous; deadly. Cowper.

Hydramide noun [ Hydr- + -amide .] (Chemistry) One of a group of crystalline bodies produced by the action of ammonia on certain aldehydes.

Hydramine noun [ Hydr oxyl + amine .] (Chemistry) 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 noun [ New Latin , from Greek "y`dwr water + ... vessel, capsule: confer French hydrangée .] (Botany) 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 noun [ Greek ... to irrigate, from "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 noun [ Hydra + Greek ... a flower.] (Zoology) 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 noun [ Hydrarg yrum + chloride .] (Chemistry) A compound of the bichloride of mercury with another chloride. [ Obsolete]

Hydrargyrate adjective Of or pertaining to mercury; containing, or impregnated with, mercury. [ R.]

Hydrargyrism noun (Medicine) A diseased condition produced by poisoning with hydrargyrum, or mercury; mercurialism.

Hydrargyrum (-rŭm) noun [ New Latin , from Latin hydrargyrus , Greek "ydra`rgyros ; "y`dwr water + 'a`rgyros silver.] (Chemistry) Quicksilver; mercury.

Hydrarthrosis noun [ New Latin See Hydro- , 1, and Arthrosis .] (Medicine) An effusion of watery liquid into the cavity of a joint.

Hydrastine noun (Chemistry) An alkaloid, found in the rootstock of the golden seal ( Hydrastis Canadensis ), and extracted as a bitter, white, crystalline substance. It is used as a tonic and febrifuge.

Hydrate noun [ Greek "y`dwr water: confer French hydrate .] (Chemistry) (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 transitive verb [ imperfect & past participle Hydrated ; present participle & verbal noun Hydrating .] To form into a hydrate; to combine with water.

Hydrated adjective Formed into a hydrate; combined with water.

Hydration noun (Chemistry) The act of becoming, or state of being, a hydrate.

Water of hydration (Chemistry) , water chemically combined with some substance to form a hydrate; -- distinguished from water of crystallization .

Hydraulic adjective [ French hydraulique , Latin hydraulicus , from Greek ..., ..., a water organ; "y`dwr water + ... flute, pipe. See Hydra .] Of or pertaining to hydraulics, or to fluids in motion; conveying, or acting by, water; as, an hydraulic clock, crane, or dock.

Hydraulic accumulator , an accumulator for hydraulic machinery of any kind. See Accumulator , 2. -- Hydraulic brake , a cataract. See Cataract , 3. -- Hydraulic cement , a cement or mortar made of hydraulic lime, which will harden under water. -- Hydraulic elevator , a lift operated by the weight or pressure of water. -- Hydraulic jack . See under Jack . -- Hydraulic lime , quicklime obtained from hydraulic limestone, and used for cementing under water, etc. -- Hydraulic limestone , a limestone which contains some clay, and which yields a quicklime that will set, or form a firm, strong mass, under water. -- Hydraulic main (Gas Works) , a horizontal pipe containing water at the bottom into which the ends of the pipes from the retorts dip, for passing the gas through water in order to remove ammonia. -- Hydraulic mining , a system of mining in which the force of a jet of water is used to wash down a bank of gold-bearing gravel or earth. [ Pacific Coast] -- Hydraulic press , a hydrostatic press. See under Hydrostatic . -- Hydraulic propeller , a device for propelling ships by means of a stream of water ejected under water rearward from the ship. -- Hydraulic ram , a machine for raising water by means of the energy of the moving water of which a portion is to be raised. When the rush of water through the main pipe d shuts the valve at a , the momentum of the current thus suddenly checked forces part of it into the air chamber b , and up the pipe c , its return being prevented by a valve at the entrance to the air chamber, while the dropping of the valve a by its own weight allows another rush through the main pipe, and so on alternately. -- Hydraulic valve . (Machinery) (a) A valve for regulating the distribution of water in the cylinders of hydraulic elevators, cranes, etc. (b) (Gas Works) An inverted cup with a partition dipping into water, for opening or closing communication between two gas mains, the open ends of which protrude about the water.

Hydraulical adjective Hydraulic.

Hydraulicon noun [ New Latin See Hydraulic .] (Mus.) An ancient musical instrument played by the action of water; a water organ. [ Written also hydraulis .]

Hydraulics noun [ Confer French hydraulique .] That branch of science, or of engineering, which treats of fluids in motion, especially of water, its action in rivers and canals, the works and machinery for conducting or raising it, its use as a prime mover, and the like.

» As a science, hydraulics includes hydrodynamics, or the principles of mechanics applicable to the motion of water; as a branch of engineering, it consists in the practical application of the mechanics of fluids to the control and management of water with reference to the wants of man, including canals, waterworks, hydraulic machines, pumps, water wheels, etc. Some writers treat hydraulics and hydrostatics as subdivisions of hydrodynamics.

Hydrazine noun [ Hydr- + azo- + -ine .] (Chemistry) Any one of a series of nitrogenous bases, resembling the amines and produced by the reduction of certain nitroso and diazo compounds; as, methyl hydrazine , phenyl hydrazine , etc. They are derivatives of hydrazine proper, H 2 N.NH 2 , which is a doubled amido group, recently (1887) isolated as a stable, colorless gas, with a peculiar, irritating odor. As a base it forms distinct salts. Called also diamide , amidogen , (or more properly diamidogen ), etc.

Hydrencephsloid adjective [ Hydrencephal us + -oid .] (Medicine) Same as Hydrocephaloid .

Hydria noun [ Latin , from Greek ....] (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 noun [ Greek ..., ..., of the water, from "y`dwr water.] (Myth.) A water nymph.

Hydric adjective [ From Hydrogen .] (Chemistry) Pertaining to, or containing, hydrogen; as, hydric oxide.

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

Hydride noun [ Hydr- + ide .] (Chemistry) A compound of the binary type, in which hydrogen is united with some other element.

Hydriform adjective [ Hydra + -form .] (Zoology) Having the form or structure of a hydra.

Hydrina noun plural [ New Latin See Hydra .] (Zoology) The group of hydroids to which the fresh-water hydras belong.

Hydriodate noun [ Confer French hydriodate .] (Zoology) Same as Hydriodide .

Hydriodic adjective [ Hydr- + iodic : confer French hydriodique .] (Chemistry) Pertaining to, or derived from, hydrogen and iodine; -- said of an acid produced by the combination of these elements.

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

Hydriodide noun (Chemistry) A compound of hydriodic acid with a base; -- distinguished from an iodide , in which only the iodine combines with the base.

Hydro noun A hydro- aëroplane.

Hydro-, Hydr-
1. A combining form from Greek ..., ..., water (see Hydra ).

2. (Chemistry) A combining form of hydrogen , indicating hydrogen as an ingredient , as hydro chloric; or a reduction product obtained by hydrogen , as hydro quinone.

Hydro-aëroplane (Aëronautics) An aëroplane with a boatlike or other understructure that enables it to travel on, or to rise from the surface of, a body of water by its own motive power.

Hydrobarometer noun [ Hydro- , 1 + barometer .] An instrument for determining the depth of the sea water by its pressure.

Hydrobilirubin noun [ Hydro- , 2 + bilirubin .] (Physiol. Chem.) A body formed from bilirubin, identical with urobilin.

Hydrobiplane noun A hydro- aëroplane having two supporting planes.

Hydrobranchiata noun plural [ New Latin , from Greek "y`dwr water + ... gills.] (Zoology) An extensive artificial division of gastropod mollusks, including those that breathe by gills, as contrasted with the Pulmonifera. -- Hy`dro*bran"chi*ate adjective

Hydrobromate noun (Chemistry) Same as Hydrobromide .

Hydrobromic adjective [ Hydro- , 2 + bromic .] (Chemistry) Composed of hydrogen and bromine; as, hydrobromic acid.

Hydrobromic acid (Chemistry) , 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 noun (Chemistry) A compound of hydrobromic acid with a base; -- distinguished from a bromide , in which only the bromine unites with the base.

Hydrocarbon noun [ Hydro- , 2 + carbon .] (Chemistry) A compound containing only hydrogen and carbon, as methane, benzene, etc.; also, by extension, any of their derivatives.

Hydrocarbon burner , furnace , stove , a burner, furnace, or stove with which liquid fuel, as petroleum, is used.

Hydrocarbonaceous adjective Of the nature, or containing, hydrocarbons.

Hydrocarbonate noun (a) (Old Chem.) A hydrocarbon. [ Obsolete] (b) (Chemistry) A hydrous carbonate, as malachite.

Hydrocarbostyril noun [ Hydro- , 2 + carbostyril .] (Chemistry) A white, crystalline, nitrogenous hydrocarbon, C 9 H 9 NO, obtained from certain derivatives of cinnamic acid and closely related to quinoline and carbostyril.

Hydrocarburet noun [ Hydro- , 2 + carburet .] (Chemistry) Carbureted hydrogen; also, a hydrocarbon. [ Obsolete]

Hydrocaulus noun ; plural Hydrocauli . [ New Latin , from Greek "y`dwr water + ... a stalk.] (Zoology) The hollow stem of a hydroid, either simple or branched. See Illust. of Gymnoblastea and Hydroidea .

Hydrocele noun [ Latin , from Greek ...; "y`dwr water + ... tumor.] (Medicine) A collection of serous fluid in the areolar texture of the scrotum or in the coverings, especially in the serous sac, investing the testicle or the spermatic cord; dropsy of the testicle.

Hydrocephalic adjective Relating to, or connected with, hydrocephalus, or dropsy of the brain.

Hydrocephaloid adjective [ Hydrocephalus + -oid .] (Medicine) Resembling hydrocephalus.

Hydrocephaloid affection (Medicine) , the group of symptoms which follow exhausting diarrhea in young children, resembling those of acute hydrocephalus, or tubercular meningitis.