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

If you see sand in the mortar joints in between your firebrick and the joints are about 3/8-inch tall, you’ve got the wrong mortar.

From Seattle Times

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

Skilled masons use a thin coating of wet fire clay to create a fireproof joint between firebrick in fireplaces.

From Seattle Times

The firebrick that should be used in a firebox is a special refractory style that is meant for high temperatures.

From Seattle Times

In the early ’70s, he began creating more conceptual installations of firebrick before turning back to clay a decade later with his geometric vessels and sculptures.

From Los Angeles Times