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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. [R.]

See Water brash, under Brash.

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.

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.

A salt of pyrosulphuric acid.

Pertaining to, or designating, an acid called also disulphuric acid) obtained by distillation of certain sulphates, as a colorless, thick, oily liquid, H2S2O7 resembling sulphuric acid. It is used in the solution of indigo, in the manufacture of alizarin, and in dehydration.

Pertaining to, or designating, an acid obtained as a white crystalline substance by the distillation of tartaric acid.

A salt of pyrotartaric acid.

A pyrotechnist.

Of or pertaining to fireworks, or the art of forming them. Pyrotechnical sponge. See under Sponge.

A pyrotechnist.

The art of making fireworks; the manufacture and use of fireworks; pyrotechny.

One skilled in pyrotechny; one who manufactures fireworks. Steevens.

Same as Pyrotechnics.

A kind of empyreumatic oil produced by the combustion of textures of hemp, linen, or cotton in a copper vessel, -- formerly used as a remedial agent. Dunglison.

Caustic. See Caustic. -- n. (Med.)

Designating an acid which is more commonly called uric acid.

Polytungstic. See Metatungstic.

Pertaining to, or designating, an acid now called cyanuric acid. See Cyanuric.

Pertaining to, or designating, an acid of vanadium, analogous to pyrophosphoric acid.