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Diabase :: Diabase (n.) A basic, dark-colored, holocrystalline, igneous rock, consisting essentially of a triclinic feldspar and pyroxene with magnetic iron; -- often limited to rocks pretertiary in age. It includes part of what was early called greenstone..

Mannite :: Mannite (n.) A white crystalline substance of a sweet taste obtained from a so-called manna, the dried sap of the flowering ash (Fraxinus ornus); -- called also mannitol, and hydroxy hexane. Cf. Dulcite..

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..

Curarine :: Curarine (n.) A deadly alkaloid extracted from the curare poison and from the Strychnos toxifera. It is obtained in crystalline colorless salts.

Chondrodite :: Chondrodite (n.) A fluosilicate of magnesia and iron, yellow to red in color, often occurring in granular form in a crystalline limestone..

Violantin :: Violantin (n.) A complex nitrogenous substance, produced as a yellow crystalline substance, and regarded as a complex derivative of barbituric acid..

Prehnitic :: Prehnitic (a.) Pertaining to, or designating, a tetrabasic acid of benzene obtained as a white crystalline substance; -- probably so called from the resemblance of the wartlike crystals to the mammillae on the surface of prehnite..

Emodin :: Emodin (n.) An orange-red crystalline substance, C15H10O5, obtained from the buckthorn, rhubarb, etc., and regarded as a derivative of anthraquinone; -- so called from a species of rhubarb (Rheum emodei)..

Terpin :: Terpin (n.) A white crystalline substance regarded as a hydrate of oil of turpentine.

Glycocoll :: Glycocoll (n.) A crystalline, nitrogenous substance, with a sweet taste, formed from hippuric acid by boiling with hydrochloric acid, and present in bile united with cholic acid. It is also formed from gelatin by decomposition with acids. Chemically, it is amido-acetic acid. Called also glycin, and glycocin..

Alanine :: Alanine (n.) A white crystalline base, C3H7NO2, derived from aldehyde ammonia..

Sulphonium :: Sulphonic (a.) Pertaining to, or derived from, a sulphone; -- used specifically to designate any one of a series of acids (regarded as acid ethereal salts of sulphurous acid) obtained by the oxidation of the mercaptans, or by treating sulphuric acid with certain aromatic bases (as benzene); as, phenyl sulphonic acid, C6H5.SO2.OH, a stable colorless crystalline substance..

Schist :: Schist (n.) Any crystalline rock having a foliated structure (see Foliation) and hence admitting of ready division into slabs or slates. The common kinds are mica schist, and hornblendic schist, consisting chiefly of quartz with mica or hornblende and often feldspar..

Umbelliferone :: Umbelliferone (n.) A tasteless white crystalline substance, C9H6O3, found in the bark of a certain plant (Daphne Mezereum), and also obtained by the distillation of certain gums from the Umbelliferae, as galbanum, asafetida, etc. It is analogous to coumarin. Called also hydroxy-coumarin..

Rosaniline :: Rosaniline (n.) A complex nitrogenous base, C20H21N3O, obtained by oxidizing a mixture of aniline and toluidine, as a colorless crystalline substance which forms red salts. These salts are essential components of many of the socalled aniline dyes, as fuchsine, aniline red, etc. By extension, any one of the series of substances derived from, or related to, rosaniline proper..

Ligustrin :: Ligustrin (n.) A bitter principle found in the bark of the privet (Ligustrum vulgare), and extracted as a white crystalline substance with a warm, bitter taste; -- called also ligustron..

Excretin :: Excretin (n.) A nonnitrogenous, crystalline body, present in small quantity in human faeces..

Quercitin :: Quercitin (n.) A yellow crystalline substance, occurring quite widely distributed in the vegetable kingdom, as is apple-tree bark, horse-chestnut leaves, etc., but originally obtained by the decomposition of quercitrin. Called also meletin..

Melamine :: Melamine (n.) A strong nitrogenous base, C3H6N6, produced from several cyanogen compounds, and obtained as a white crystalline substance, -- formerly supposed to be produced by the decomposition of melam. Called also cyanuramide..

Protocatechuic :: Protocatechuic (a.) Pertaining to, derived from, or designating, an organic acid which is obtained as a white crystalline substance from catechin, asafetida, oil of cloves, etc., and by distillation itself yields pyrocatechin..

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