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An insane disposition to incendiarism.

Of or pertaining to pyromancy.

An instrument used for measuring the expansion of solid bodies by heat.

Pertaining to, or obtained by, the pyrometer; as, pyrometrical instruments; pyrometrical measurements.

The art of measuring degrees of heat, or the expansion of bodies by heat.

Native lead phosphate with lead chloride, occurring in bright green and brown hexagonal crystals and also massive; -- so called because a fused globule crystallizes in cooling.

Having the property of crystallizing by the agency of fire.

A salt of pyromucic acid.

Pertaining to, derived from, or designating, an acid obtained as a white crystalline substance by the distillation of mucic acid, or by the oxidation of furfurol.

An unsaturated cyclic compound, C5H4O2, of which two varieties are known, a and g. g-pyrone is the parent substance of several natural yellow dyestuffs.

The science of heat.

A variety of garnet, of a poppy or blood-red color, frequently with a tinge of orange. It is used as a gem. See the Note under Garnet.

A mineral which is opaque in its natural state, but is said to change its color and become transparent by heat.

Rendered transparent by heat.

A musical instrument in which the tones are produced by flames of hydrogen, or illuminating gas, burning in tubes of different sizes and lengths.

Light-producing; of or pertaining to pyrophorus. Pyrophoric iron (Chem.), finely reduced iron, which ignites spontaneously on contact with air.

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.

A salt of pyrophosphoric acid.

Pertaining to, or designating, an acid, H4P2O7, which is obtained as a white crystalline substance. Its salts are obtained by heating the phosphates.

A mineral, usually of a white or greenish color and pearly luster, consisting chiefly of the hydrous silicate of alumina.