Vocabulary : Pyrophoric to Pyrosome

Pyrophoric : Alt. of Pyrophorous
Pyrophorous : Light-producing; of or pertaining to pyrophorus.
Pyrophorus : Any one of several substances or mixtures which phosphoresce or ignite spontaneously on exposure to air, as a heated mixture of alum, potash, and charcoal, or a mixture of charcoal and finely divided lead.
Pyrophosphate : A salt of pyrophosphoric acid.
Pyrophosphoric : Pertaining to, or designating, an acid, H4P2O7, which is obtained as a white crystalline substance. Its salts are obtained by heating the phosphates.

Pyrophyllite : A mineral, usually of a white or greenish color and pearly luster, consisting chiefly of the hydrous silicate of alumina.
Pyroscope : An instrument for measuring the intensity of heat radiating from a fire, or the cooling influence of bodies. It is a differential thermometer, having one bulb coated with gold or silver leaf.
Pyrosis : See Water brash, under Brash.
Pyrosmalite : A mineral, usually of a pale brown or of a gray or grayish green color, consisting chiefly of the hydrous silicate of iron and manganese; -- so called from the odor given off before the blowpipe.
Pyrosome : Any compound ascidian of the genus Pyrosoma. The pyrosomes form large hollow cylinders, sometimes two or three feet long, which swim at the surface of the sea and are very phosphorescent.

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