Fire"stone` (?; 110), n. [AS. frstan flint; fr fire + stan stone.] 1. Iron pyrites, formerly used for striking fire; also, a flint.
2. 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.
Ure.
© Webster 1913. | 
