firebrick
/ˈfaɪərˌbrɪk/
noun
- A brick made of heat-resistant material, used to line furnaces, fireplaces, and chimneys.
- The blacksmith replaced the cracked firebrick in the forge.
- Firebrick is essential for building a pizza oven that can reach very high temperatures.
- The old chimney was lined with firebrick to prevent the house from catching fire.