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Pyrolusite
n.
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Manganese dioxide, a mineral of an iron-black or dark steel-gray color and metallic luster, usually soft. Pyrolusite parts with its oxygen at a red heat, and is extensively used in discharging the brown and green tints of glass (whence its name).
Pyromagnetic
a.
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Acting by the agency of heat and magnetism; as, a pyromagnetic machine for producing electric currents.
Pyromalate
n.
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A salt of pyromalic acid.
Pyromalic
a.
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Pertaining to, or designating, an acid now called maleic acid.
Pyromancy
n.
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Divination by means of fire.
Pyromania
n.
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An insane disposition to incendiarism.
Pyromantic
a.
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Of or pertaining to pyromancy.
Pyromantic
n.
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One who pretends to divine by fire.
Pyrometer
n.
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An instrument used for measuring the expansion of solid bodies by heat.
Pyrometer
n.
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An instrument for measuring degrees of heat above those indicated by the mercurial thermometer.
Pyrometric
a.
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Alt. of Pyrometrical
Pyrometrical
a.
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Pertaining to, or obtained by, the pyrometer; as, pyrometrical instruments; pyrometrical measurements.
Pyrometry
n.
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The art of measuring degrees of heat, or the expansion of bodies by heat.
Pyromorphite
n.
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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.
Pyromorphous
a.
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Having the property of crystallizing by the agency of fire.
Pyromucate
n.
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A salt of pyromucic acid.
Pyromucic
a.
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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.
Pyronomics
n.
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The science of heat.
Pyrope
n.
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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.
Pyrophane
n.
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A mineral which is opaque in its natural state, but is said to change its color and become transparent by heat.
Pyrophanous
a.
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Rendered transparent by heat.
Pyrophone
n.
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A musical instrument in which the tones are produced by flames of hydrogen, or illuminating gas, burning in tubes of different sizes and lengths.
Pyrophoric
a.
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Alt. of Pyrophorous
Pyrophorous
a.
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Light-producing; of or pertaining to pyrophorus.
Pyrophorus
n.
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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
n.
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A salt of pyrophosphoric acid.
Pyrophosphoric
a.
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Pertaining to, or designating, an acid, H4P2O7, which is obtained as a white crystalline substance. Its salts are obtained by heating the phosphates.
Pyrophyllite
n.
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A mineral, usually of a white or greenish color and pearly luster, consisting chiefly of the hydrous silicate of alumina.
Pyroscope
n.
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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
n.
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See Water brash, under Brash.