firebrick

[ fahyuh r-brik ]
/ ˈfaɪərˌbrɪk /

noun

a brick made of fire clay.

Origin of firebrick

First recorded in 1785–95; fire + brick
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

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British Dictionary definitions for firebrick

firebrick

/ (ˈfaɪəˌbrɪk) /

noun

a refractory brick made of fire clay, used for lining furnaces, flues, etc
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012