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Thecophora :: Thecophora (n. pl.) A division of hydroids comprising those which have the hydranths in thecae and the gonophores in capsules. The campanularians and sertularians are examples. Called also Thecata. See Illust. under Hydroidea.

Hydraulics :: Hydraulics (n.) 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..

Hydrazine :: Hydrazine (n.) 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, H2N.NH2, 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..

Oxyacid :: Oxyacid (n.) An acid containing oxygen, as chloric acid or sulphuric acid; -- contrasted with the hydracids, which contain no oxygen, as hydrochloric acid. See Acid, and Hydroxy-..

Hydraemia :: Hydraemia (n.) An abnormally watery state of the blood; anaemia.

Mannitan :: Mannitan (n.) A white amorphous or crystalline substance obtained by the partial dehydration of mannite.

Hydriform :: Hydriform (a.) Having the form or structure of a hydra.

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..

Isogonism :: Isogonism (n.) The quality of having similar sexual zooids or gonophores and dissimilar hydrants; -- said of certain hydroids.

Liroconite :: Liroconite (n.) A hydrated arseniate of copper, occurring in obtuse pyramidal crystals of a sky-blue or verdigris-green color..

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..

Hydrated :: Hydrated (imp. & p. p.) of Hydrat.

Hydrargyrum :: Hydrargyrum (n.) Quicksilver; mercury.

Aluminate :: Aluminate (n.) A compound formed from the hydrate of aluminium by the substitution of a metal for the hydrogen.

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..

Dehydration :: Dehydration (n.) The act or process of freeing from water; also, the condition of a body from which the water has been removed..

Hydroid :: Hydroid (a.) Related to, or resembling, the hydra; of or pertaining to the Hydroidea..

Dextrin :: Dextrin (n.) A translucent, gummy, amorphous substance, nearly tasteless and odorless, used as a substitute for gum, for sizing, etc., and obtained from starch by the action of heat, acids, or diastase. It is of somewhat variable composition, containing several carbohydrates which change easily to their respective varieties of sugar. It is so named from its rotating the plane of polarization to the right; -- called also British gum, Alsace gum, gommelin, leiocome, etc. See Achroodextrin, and Ery

Beauxite :: Beauxite (n.) A ferruginous hydrate of alumina. It is largely used in the preparation of aluminium and alumina, and for the lining of furnaces which are exposed to intense heat..

Arabin :: Arabin (n.) A carbohydrate, isomeric with cane sugar, contained in gum arabic, from which it is extracted as a white, amorphous substance..

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