- a refractory brick made of fire clay, used for lining furnaces, flues, etc
WordReference Random House Unabridged Dictionary of American English © 2026
fire•brick
(fīər′brik′),USA pronunciation n.
- Buildinga brick made of fire clay.
- fire + brick 1785–95
Collins Concise English Dictionary © HarperCollins Publishers::
firebrick /ˈfaɪəˌbrɪk/ n