Pyrophorus
Pronunciation : Py*roph"o*rus
Part of Speech : n.
Etymology : [NL. See Pyrophorous.] (Old Chem.)
Definition : Defn: Any one of several substances or mixtures which phosphoresce or ignite spontaneously on exposure to air, as a heated mixture of alum, potash, and charcoal, or a mixture of charcoal and finely divided lead.
Source : Webster's Unabridged Dictionary, 1913