Index of English words, starting with "py"

(1) - Pyrology (n.) That branch of physical science which treats of the properties, phenomena, or effects of heat; also, a treatise on heat.

(1) - Pyrolusite (n.) 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).