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

Galactin :: Galactin (n.) An amorphous, gummy carbohydrate resembling gelose, found in the seeds of leguminous plants, and yielding on decomposition several sugars, including galactose..
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..
Hydramide :: Hydramide (n.) One of a group of crystalline bodies produced by the action of ammonia on certain aldehydes.
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..
Hydrargochloride :: Hydrargochloride (n.) A compound of the bichloride of mercury with another chloride.
Hydranth :: Hydranth (n.) One of the nutritive zooids of a hydroid colony. Also applied to the proboscis or manubrium of a hydroid medusa. See Illust. of Hydroidea.
Lake :: Lake (n.) A pigment formed by combining some coloring matter, usually by precipitation, with a metallic oxide or earth, esp. with aluminium hydrate; as, madder lake; Florentine lake; yellow lake, etc..
Hydroid :: Hydroid (a.) Related to, or resembling, the hydra; of or pertaining to the Hydroidea..
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..
Terpinol :: Terpinol (n.) Any oil substance having a hyacinthine odor, obtained by the action of acids on terpin, and regarded as a related hydrate..
Hydrargyrate :: Hydrargyrate (a.) Of or pertaining to mercury; containing, or impregnated with, mercury..
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..
Humin :: Humin (n.) A bitter, brownish yellow, amorphous substance, extracted from vegetable mold, and also produced by the action of acids on certain sugars and carbohydrates; -- called also humic acid, ulmin, gein, ulmic or geic acid, etc..
Hydras :: Hydras (pl. ) of Hydr.
Hydrate :: Hydrate (v. t.) To form into a hydrate; to combine with water.
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..
Pectose :: Pectose (n.) An amorphous carbohydrate found in the vegetable kingdom, esp. in unripe fruits. It is associated with cellulose, and is converted into substances of the pectin group..
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..
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..
Hydraulical :: Hydraulical (a.) Hydraulic.
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