firebrick

American  

[fahyuhr-brik] / ˈfaɪərˌbrɪk /

noun

1. a brick made of fire clay.

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firebrick British  

/ ˈfaɪəˌbrɪk /

noun

1. a refractory brick made of fire clay, used for lining furnaces, flues, etc

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Etymology

Origin of firebrick

First recorded in 1785–95; fire + brick

Example Sentences

One of the biggest mistakes I routinely see is the use of regular mortar to set the actual high-temperature firebrick.

From Seattle Times • Jan. 16, 2023

It’s mesmerizing to watch him skillfully use a thin coating of wet fire clay to create a fireproof joint between firebrick in fireplaces.

From Washington Post • Dec. 7, 2021

Magnesium oxide is important in making firebrick, crucibles, furnace linings, and thermal insulation—applications that require chemical and thermal stability.

From Textbooks • Feb. 14, 2019

What the team has done here is to re-think the nuclear process by combining the reactor with a firebrick storage option. 

From Forbes • Sep. 22, 2014

They walked through the diningroom where the firebrick in the hearth was as yellow as the day it was laid because his mother could not bear to see it blackened.

From "The Road" by Cormac McCarthy