Bible Dictionaries
Pyrophorus
Webster's Dictionary
(n.) 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.
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Bibliography Information
Webster, Noah. Entry for 'Pyrophorus'. Noah Webster's American Dictionary. https://www.studylight.org/dictionaries/eng/web/p/pyrophorus.html. 1828.