Definition of hydra

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Hydra (n.) Hence: A multifarious evil, or an evil having many sources; not to be overcome by a single effort..

Lern More About Hydra

Hydraemia :: Hydraemia (n.) An abnormally watery state of the blood; anaemia.
Bud :: Bud (n.) A small protuberance on certain low forms of animals and vegetables which develops into a new organism, either free or attached. See Hydra..
Neuter :: Neuter (n.) An organism, either vegetable or animal, which at its maturity has no generative organs, or but imperfectly developed ones, as a plant without stamens or pistils, as the garden Hydrangea; esp., one of the imperfectly developed females of certain social insects, as of the ant and the common honeybee, which perform the labors of the community, and are called workers..
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..
Hydragogue :: Hydragogue (a.) Causing a discharge of water; expelling serum effused into any part of the body, as in dropsy..
Gummite :: Gummite (n.) A yellow amorphous mineral, essentially a hydrated oxide of uranium derived from the alteration of uraninite..
Hose :: Hose (n.) A flexible pipe, made of leather, India rubber, or other material, and used for conveying fluids, especially water, from a faucet, hydrant, or fire engine..
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..
Sulphydric :: Sulphydrate (n.) A compound, analogous to a hydrate, regarded as a salt of sulphydric acid, or as a derivative of hydrogen sulphide in which one half of the hydrogen is replaced by a base (as potassium sulphydrate, KSH), or as a hydrate in which the oxygen has been wholly or partially replaced by sulphur..
Sinistrin :: Sinistrin (n.) A mucilaginous carbohydrate, resembling achroodextrin, extracted from squill as a colorless amorphous substance; -- so called because it is levorotatory..
Hydrargochloride :: Hydrargochloride (n.) A compound of the bichloride of mercury with another chloride.
Ethylate :: Ethylate (n.) A compound derived from ethyl alcohol by the replacement of the hydroxyl hydrogen, after the manner of a hydrate; an ethyl alcoholate; as, potassium ethylate, C2H5.O.K..
Hydracid :: Hydracid (n.) An acid containing hydrogen; -- sometimes applied to distinguish acids like hydrochloric, hydrofluoric, and the like, which contain no oxygen, from the oxygen acids or oxacids. See Acid..
Lime :: Lime (v. t.) To treat with lime, or oxide or hydrate of calcium; to manure with lime; as, to lime hides for removing the hair; to lime sails in order to whiten them..
Polypite :: Polypite (n.) One of the feeding zooids, or polyps, of a coral, hydroid, or siphonophore; a hydranth. See Illust. of Campanularian..
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..
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..
Grizzly :: Grizzly (a.) In hydraulic mining, gratings used to catch and throw out large stones from the sluices..
Terpinol :: Terpinol (n.) Any oil substance having a hyacinthine odor, obtained by the action of acids on terpin, and regarded as a related hydrate..
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..
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