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

Hydrosalt :: Hydrosalt (n.) A hydrous salt; a salt combined with water of hydration or crystallization.
Terpin :: Terpin (n.) A white crystalline substance regarded as a hydrate of oil of turpentine.
Dehydrate :: Dehydrate (v. t.) To deprive of water; to render free from water; as, to dehydrate alcohol..
Hydra :: Hydra (n.) Hence: A multifarious evil, or an evil having many sources; not to be overcome by a single effort..
Hydra :: Hydra (n.) A southern constellation of great length lying southerly from Cancer, Leo, and Virgo..
Hydramide :: Hydramide (n.) One of a group of crystalline bodies produced by the action of ammonia on certain aldehydes.
Saccharate :: Saccharate (n.) In a wider sense, a compound of saccharose, or any similar carbohydrate, with such bases as the oxides of calcium, barium, or lead; a sucrate..
Methylate :: Methylate (n.) An alcoholate of methyl alcohol in which the hydroxyl hydrogen is replaced by a metal, after the analogy of a hydrate; as, sodium methylate, CH3ONa..
Hydrina :: Hydrina (n. pl.) The group of hydroids to which the fresh-water hydras belong.
Pyrosulphuric :: Pyrosulphuric (a.) Pertaining to, or designating, an acid called also disulphuric acid) obtained by distillation of certain sulphates, as a colorless, thick, oily liquid, H2S2O7 resembling sulphuric acid. It is used in the solution of indigo, in the manufacture of alizarin, and in dehydration..
Gummite :: Gummite (n.) A yellow amorphous mineral, essentially a hydrated oxide of uranium derived from the alteration of uraninite..
Glycide :: Glycide (n.) A colorless liquid, obtained from certain derivatives of glycerin, and regarded as a partially dehydrated glycerin; -- called also glycidic 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..
Verditer :: Verditer (n.) Either one of two pigments (called blue verditer, and green verditer) which are made by treating copper nitrate with calcium carbonate (in the form of lime, whiting, chalk, etc.) They consist of hydrated copper carbonates analogous to the minerals azurite and malachite..
Hydrosulphide :: Hydrosulphide (n.) One of a series of compounds, derived from hydrogen sulphide by the replacement of half its hydrogen by a base or basic radical; as, potassium hydrosulphide, KSH. The hydrosulphides are analogous to the hydrates and include the mercaptans..
Cellulose :: Cellulose (n.) The substance which constitutes the essential part of the solid framework of plants, of ordinary wood, linen, paper, etc. It is also found to a slight extent in certain animals, as the tunicates. It is a carbohydrate, (C6H10O5)n, isomeric with starch, and is convertible into starches and sugars by the action of heat and acids. When pure, it is a white amorphous mass. See Starch, Granulose, Lignin..
Hydraemia :: Hydraemia (n.) An abnormally watery state of the blood; anaemia.
Thionol :: Thionol (n.) A red or violet dyestuff having a greenish metallic luster. It is produced artificially, by the chemical dehydration of thionine, as a brown amorphous powder..
Hydrarthrosis :: Hydrarthrosis (n.) An effusion of watery liquid into the cavity of a joint.
Theca :: Theca (n.) The chitinous cup which protects the hydranths of certain hydroids.
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