pyrosis

[Gr. pyrosis =a burning; pyroō = Pathol. Water-brash; a form of eructation, with pain in the epigastric region, from which water, either tastele or sour and acrid, rises into the mouth. pyr-öş-ma-lite, s. [Pref. pyr-; Greek osmē = smell, and lithos = stone; Ger. pirodmalit, pyros mal it.] Min.: A mineral found in crystals and lamellar ma ive in some iron mines in Wermland, Sweden, Crystallization, hexagonal; cleavage, basal. Hardne , 4-4.5; specific gravity, 3-3-2; luster, somewhat pearly; color, blackish-green to pale liver-brown; streak, paler; fracture, uneven, splintery. Com position: A hydrated silicate of iron and manganese with chloride of iron. pyr-o-sō-mą s. [Pref. pyro-, and Gr. sōma = the body.] Zool.: The sole genus of Pyrosomide, a family of Tunic at a (q. v.), with three species. Animals, compound, free, and pelagic, ranging from two to fourteen inches in length, and from half an inch to three inches in circumference. They are brilliantly phosphorescent, and Péron compared them to small incandescent cylinders of iron. (See Phil . Trans., 1851, pp. 567-593.) pyr-o-some, s. [PYROSOMA.] Any individual of the genus Pyrosoma (q. v.).