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.

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