firestone
/ˈfaɪərˌstoʊn/
noun
- A stone that is hard enough to strike against steel to produce sparks, used for starting fires.
- The hiker used a firestone and a piece of steel to light the campfire.
- He struck the firestone against his knife, and a shower of sparks flew out.
- In ancient times, people carried a firestone to make fire on the go.
- A stone that is resistant to heat, used in furnaces or fireplaces.
- The blacksmith lined the forge with firestone to withstand high temperatures.
- They built the fireplace with firestone to prevent cracking.
- Firestone bricks are commonly used in industrial kilns.