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. [1913 Webster]

The Collaborative International Dictionary of English. 2000.

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