n. [ See Pyrophanous. ] (Min.) A mineral which is opaque in its natural state, but is said to change its color and become transparent by heat. [ 1913 Webster ]
n. [ Propyl + methane. ] (Chem.) A heavy gaseous hydrocarbon, C3H8, of the paraffin series, occurring naturally dissolved in crude petroleum, and also made artificially; -- called also propyl hydride. [ 1913 Webster ]