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English definition of “firebrick”

firebrick

noun [C] uk   /ˈfaɪə.brɪk/ us    /ˈfaɪr-/ UK
a brick that is not damaged by high temperatures and is therefore used when building things, such as chimneys and fireplaces, that will reach high temperaturesThe fireplace and parts of the fireplace
(Definition of firebrick from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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