PYROSCOPE
Pyr"o*scope, n. Etym: [Pyro- + -scope: cf. F. pyroscope.] (Physics)
Defn: 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.]
PYROSIS
Py*ro"sis, n. Etym: [NL., fr Gr. (Med.)
Defn: See Water brash, under Brash.
PYROSMALITE
Py*ros"ma*lite, n. Etym: [Pyro- + Gr. -like. ] (Min.)
Defn: 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
Pyr"o*some, n. Etym: [Pyro- + -some body.] (Zoöl.)
Defn: 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.
PYROSULPHATE
Pyr`o*sul"phate, n. (Chem.)
Defn: A salt of pyrosulphuric acid.