Firestone

['faiəstəun]

Definition

(noun.) a sandstone that withstands intense heat; used to line fireplaces and furnaces and kilns.

(noun.) a piece of flint that is struck to light a fire.

Editor: Ned--From WordNet

Definition

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

(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.

Checked by Keith