Definition of hydra

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Hydra (n.) Any small fresh-water hydroid of the genus Hydra, usually found attached to sticks, stones, etc., by a basal sucker..

Lern More About Hydra

Hydrargochloride :: Hydrargochloride (n.) A compound of the bichloride of mercury with another chloride.
Glycide :: Glycide (n.) A colorless liquid, obtained from certain derivatives of glycerin, and regarded as a partially dehydrated glycerin; -- called also glycidic alcohol..
Hydras :: Hydras (pl. ) of Hydr.
Acrolein :: Acrolein (n.) A limpid, colorless, highly volatile liquid, obtained by the dehydration of glycerin, or the destructive distillation of neutral fats containing glycerin. Its vapors are intensely irritating..
Cryohydrate :: Cryohydrate (n.) A substance, as salt, ammonium chloride, etc., which crystallizes with water of crystallization only at low temperatures, or below the freezing point of water..
Thiophenol :: Thiophenol (n.) A colorless mobile liquid, C6H5.SH, of an offensive odor, and analogous to phenol; -- called also phenyl sulphydrate..
Dehydrate :: Dehydrate (v. t.) To deprive of water; to render free from water; as, to dehydrate alcohol..
Saxifragaceous :: Saxifragaceous (a.) Of or pertaining to a natural order of plants (Saxifragaceae) of which saxifrage is the type. The order includes also the alum root, the hydrangeas, the mock orange, currants and gooseberries, and many other plants..
Accumulator :: Accumulator (n.) An apparatus by means of which energy or power can be stored, such as the cylinder or tank for storing water for hydraulic elevators, the secondary or storage battery used for accumulating the energy of electrical charges, etc..
Normal :: Normal (a.) Denoting certain hypothetical compounds, as acids from which the real acids are obtained by dehydration; thus, normal sulphuric acid and normal nitric acid are respectively S(OH)6, and N(OH)5..
Seminose :: Seminose (n.) A carbohydrate of the glucose group found in the thickened endosperm of certain seeds, and extracted as yellow sirup having a sweetish-bitter taste..
Polyacid :: Polyacid (a.) Capable of neutralizing, or of combining with, several molecules of a monobasic acid; having more than one hydrogen atom capable of being replaced by acid radicals; -- said of certain bases; as, calcium hydrate and glycerin are polyacid bases..
Hydracrylic :: Hydracrylic (a.) Pertaining to, or designating, an isomeric variety of lastic acid that breaks down into acrylic acid and water..
Waterwork :: Waterwork (n.) An hydraulic apparatus, or a system of works or fixtures, by which a supply of water is furnished for useful or ornamental purposes, including dams, sluices, pumps, aqueducts, distributing pipes, fountains, etc.; -- used chiefly in the plural..
Pump :: Pump (n.) An hydraulic machine, variously constructed, for raising or transferring fluids, consisting essentially of a moving piece or piston working in a hollow cylinder or other cavity, with valves properly placed for admitting or retaining the fluid as it is drawn or driven through them by the action of the piston..
Hydrastine :: Hydrastine (n.) 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..
Standpipe :: Standpipe (n.) A vertical pipe, open at the top, between a hydrant and a reservoir, to equalize the flow of water; also, a large vertical pipe, near a pumping engine, into which water is forced up, so as to give it sufficient head to rise to the required level at a distance..
Hydramide :: Hydramide (n.) One of a group of crystalline bodies produced by the action of ammonia on certain aldehydes.
Feeder :: Feeder (n.) A stream that flows into another body of water; a tributary; specifically (Hydraulic Engin.), a water course which supplies a canal or reservoir by gravitation or natural flow..
Triticin :: Triticin (n.) A carbohydrate isomeric with dextrin, obtained from quitch grass (Agropyrum, formerly Triticum, repens) as a white amorphous substance..
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