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Hydroxyl :: Hydroxyl (n.) A compound radical, or unsaturated group, HO, consisting of one atom of hydrogen and one of oxygen. It is a characteristic part of the hydrates, the alcohols, the oxygen acids, 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..

Tropidine :: Tropidine (n.) An alkaloid, C8H13N, obtained by the chemical dehydration of tropine, as an oily liquid having a coninelike odor..

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.

Water Lime :: Water lime () Hydraulic lime.

Brucite :: Brucite (n.) A white, pearly mineral, occurring thin and foliated, like talc, and also fibrous; a native magnesium hydrate..

Hydr- :: Hydr- () A combining form from Gr. /, /, water (see Hydra)..

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..

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..

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..

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

Hydraulic :: Hydraulic (a.) Of or pertaining to hydraulics, or to fluids in motion; conveying, or acting by, water; as, an hydraulic clock, crane, or dock..

Pectin :: Pectin (n.) One of a series of carbohydrates, commonly called vegetable jelly, found very widely distributed in the vegetable kingdom, especially in ripe fleshy fruits, as apples, cranberries, etc. It is extracted as variously colored, translucent substances, which are soluble in hot water but become viscous on cooling..

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..

Hydrargyrate :: Hydrargyrate (a.) Of or pertaining to mercury; containing, or impregnated with, mercury..

Water Cement :: Water cement () Hydraulic cement.

Thiophenol :: Thiophenol (n.) A colorless mobile liquid, C6H5.SH, of an offensive odor, and analogous to phenol; -- called also phenyl sulphydrate..

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..

Tubularia :: Tubularia (n.) A genus of hydroids having large, naked, flowerlike hydranths at the summits of long, slender, usually simple, stems. The gonophores are small, and form clusters at the bases of the outer tentacles..

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

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