Word Study
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pyrophorus
CIDE DICTIONARY
pyrophorus, n. [NL. See Pyrophorous.].
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]
For further exploring for "pyrophorus" in Webster Dictionary Online