fire-stone noun. ['fʌɪǝstǝʊn] OE.
[from FIRE noun + STONE noun.]
1. A stone used in striking fire, esp. iron pyrites. Also, the flint of a firelock. arch. OE.

2. A stone that resists the action of fire, used for lining furnaces, ovens, etc. L15.
b. Any of certain soft calcareous sandstones. local. E18.

3. A hearth-stone. Now rare. E17.

[TahlilGaran] English Dictionary ▲