pyrophorus

Pyrophorus

Py*roph"o*rus\, n. [NL. See Pyrophorous.] (Old Chem.) 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.
Webster's Revised Unabridged Dictionary, © 1996, 1998 MICRA, Inc.
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