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

Hydrachnid :: Hydrachnid (n.) An aquatic mite of the genus Hydrachna. The hydrachnids, while young, are parasitic on fresh-water mussels..

Hydrous :: Hydrous (a.) Containing water of hydration or crystallization.

Hydra :: Hydra (n.) Any small fresh-water hydroid of the genus Hydra, usually found attached to sticks, stones, etc., by a basal sucker..

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..

Air Chamber :: Air chamber () A cavity containing air to act as a spring for equalizing the flow of a liquid in a pump or other hydraulic machine.

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..

Hydramide :: Hydramide (n.) One of a group of crystalline bodies produced by the action of ammonia on certain aldehydes.

Polypite :: Polypite (n.) One of the feeding zooids, or polyps, of a coral, hydroid, or siphonophore; a hydranth. See Illust. of Campanularian..

Hydra :: Hydra (n.) A serpent or monster in the lake or marsh of Lerna, in the Peloponnesus, represented as having many heads, one of which, when cut off, was immediately succeeded by two others, unless the wound was cauterized. It was slain by Hercules. Hence, a terrible monster..

Ram :: Ram (n.) A hydraulic ram. See under Hydraulic.

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

Hydrotheca :: Hydrotheca (n.) One of the calicles which, in some Hydroidea (Thecaphora), protect the hydrants. See Illust. of Hydroidea, and Campanularian..

Hydrate :: Hydrate (n.) A substance which does not contain water as such, but has its constituents (hydrogen, oxygen, hydroxyl) so arranged that water may be eliminated; hence, a derivative of, or compound with, hydroxyl; hydroxide; as, ethyl hydrate, or common alcohol; calcium hydrate, or slaked lime..

Tartrazine :: Tartrazine (n.) An artificial dyestuff obtained as an orange-yellow powder, and regarded as a phenyl hydrazine derivative of tartaric and sulphonic acids..

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

Centaur :: Centaur (n.) A constellation in the southern heavens between Hydra and the Southern Cross.

Gymnochroa :: Gymnochroa (n. pl.) A division of Hydroidea including the hydra. See Hydra.

Gummite :: Gummite (n.) A yellow amorphous mineral, essentially a hydrated oxide of uranium derived from the alteration of uraninite..

Carbohydrate :: Carbohydrate (n.) One of a group of compounds including the sugars, starches, and gums, which contain six (or some multiple of six) carbon atoms, united with a variable number of hydrogen and oxygen atoms, but with the two latter always in proportion as to form water; as dextrose, C6H12O6..

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