Definition of firebrick noun from the Oxford Advanced Learner's Dictionary

 

firebrick

 noun
noun
BrE BrE//ˈfaɪəbrɪk//
 
; NAmE NAmE//ˈfaɪərbrɪk//
 
[uncountable, countable](specialist)
 
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brick which is not destroyed by very strong heat; an individual block of this
See the Oxford Advanced American Dictionary entry: firebrick