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

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

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..

Magnesia :: Magnesia (n.) A light earthy white substance, consisting of magnesium oxide, and obtained by heating magnesium hydrate or carbonate, or by burning magnesium. It has a slightly alkaline reaction, and is used in medicine as a mild antacid laxative. See Magnesium..

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

Dashpot :: Dashpot (n.) A pneumatic or hydraulic cushion for a falling weight, as in the valve gear of a steam engine, to prevent shock..

Hydrate :: Hydrate (v. t.) To form into a hydrate; to combine with water.

Hydra :: Hydra (n.) A southern constellation of great length lying southerly from Cancer, Leo, and Virgo..

Water Lime :: Water lime () Hydraulic lime.

Seminose :: Seminose (n.) A carbohydrate of the glucose group found in the thickened endosperm of certain seeds, and extracted as yellow sirup having a sweetish-bitter taste..

Saccharonic :: Saccharonic (a.) Of, pertaining to, or derived from, saccharone; specifically, designating an unstable acid which is obtained from saccharone (a) by hydration, and forms a well-known series of salts..

Hydrargyrism :: Hydrargyrism (n.) A diseased condition produced by poisoning with hydrargyrum, or mercury; mercurialism..

Hydrated :: Hydrated (a.) Formed into a hydrate; combined with water.

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.

Hydrosalt :: Hydrosalt (n.) A salt supposed to be formed by a hydracid and a base.

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..

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

Potash :: Potash (n.) The hydroxide of potassium hydrate, a hard white brittle substance, KOH, having strong caustic and alkaline properties; -- hence called also caustic potash..

Salt :: salt () Sulphate of magnesia having cathartic qualities; -- originally prepared by boiling down the mineral waters at Epsom, England, -- whence the name; afterwards prepared from sea water; but now from certain minerals, as from siliceous hydrate of magnesia..

Hydractinian :: Hydractinian (n.) Any species or marine hydroids, of the genus Hydractinia and allied genera. These hydroids form, by their rootstalks, a firm, chitinous coating on shells and stones, and esp. on spiral shells occupied by hermit crabs. See Illust. of Athecata..

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