PYROPHORUS

pyrophorus. Pyrophorus, n. a substance which takes fire on exposure to air

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‖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.