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Pertaining to, or designating, an acid, C5H8N4O6, which is obtained, as a white crystalline substance, by the slow oxidation of uric acid in alkaline solution.

Pertaining to, or designating, a complex acid obtained, as a yellow crystalline substance, from certain genera of lichens (Usnea, Parmelia, etc.).

signating an organic acid, C7H8O3 (also called pyrotritartaric acid), obtained as a white crystalline substance by the decomposition of tartaric and pyrotartaric acids.

Pertaining to, or designating, an acid, CH3C6H3(CO2H)2, obtained as a white crystalline substance by the partial oxidation of mesitylene; -- called also mesitic acid.

Pertaining to, or designating, an acid which is obtained as a white crystalline substance by the action of ammonia on pyrotartaric acid.

The acid amide derivative of valeric acid, obtained as a white crystalline substance.

A mineral occurring in yellowish, and ruby-red hexagonal crystals. It consist of lead vanadate with a small proportion of lead chloride.

A white crystalline aldehyde having a burning taste and characteristic odor of vanilla. It is extracted from vanilla pods, and is also obtained by the decomposition of coniferin, and by the oxidation of eugenol.

pon any part, especially upon the valves of the heart. Vegetation of salts (Old Chem.), a crystalline growth of an arborescent form.

d shining stem and branches. -- Venus's hair stone (Min.), quartz penetrated by acicular crystals of rutile. -- Venus's looking-glass (Bot.), an annual plant of the genus Specularia allied to the bellflower; -- also called lady's looking- glass. -- Venus's navelwort (Bot.), any one of several species of Omphalodes,…

root of white hellebore (Veratrum album), and in sabadilla seed; -- extracted as a white crystalline substance which is related to protocatechuic acid.

alkaloid obtained from the root hellebore (Veratrum) and from sabadilla seeds as a white crystalline powder, having an acrid, burning taste. It is sometimes used externally, as in ointments, in the local treatment of neuralgia and rheumatism. Called also veratria, and veratrina.

An alkaloid extracted from the shoots of the vetch, red clover, etc., as a white crystalline substance.

A mineral occurring in tetragonal crystals, and also massive, of a brown to green color, rarely sulphur yellow and blue. It is a silicate of alumina and lime with some iron magnesia, and is common at Vesuvius. Also called idocrase.

Near; vicine. T. Warton. Vicinal planes (Min.), subordinate planes on a crystal, which are very near to the fundamental planes in angles, and sometimes take their place. They have in general very complex symbols.

An alkaloid ex tracted from the seeds of the vetch (Vicia sativa) as a white crystalline substance.

d by Sir William Crookes in 1898. Its nitrate is obtained byy practical decomposition and crystallization of yttrium nitrate. At. wt., about 117.

A complex nitrogenous substance, produced as a yellow crystalline substance, and regarded as a complex derivative of barbituric acid.

A yellow crystalline glucoside obtained from the pansy (Viola tricolor), and decomposing into glucose and quercitrin.

ing, a complex nitroso derivative of barbituric acid. It is obtained as a white or yellow crystalline substance, and forms characteristic yellow, blue, and violet salts.