Definition of firebrick
: a refractory brick capable of sustaining high temperatures that is used especially for lining furnaces or fireplaces
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Its dense firebrick floor draws and holds the fire’s heat; the insulated crown stores heat overhead, balancing the thermal mass and radiating heat downward.
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First Known Use of firebrick
1749
Learn More about firebrick
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See words that rhyme with firebrick Britannica.com: Encyclopedia article about firebrick
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