Bible Dictionaries
Firestone

Webster's Dictionary

(1):

(n.) A stone which will bear the heat of a furnace without injury; - especially applied to the sandstone at the top of the upper greensand in the south of England, used for lining kilns and furnaces.

(2):

(n.) Iron pyrites, formerly used for striking fire; also, a flint.

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