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firebrick

noun

fire·​brick ˈfī(-ə)r-ˌbrik How to pronounce firebrick (audio)
: a refractory brick capable of sustaining high temperatures that is used especially for lining furnaces or fireplaces

Example Sentences

Recent Examples on the Web The other is lined with furnace cement, then covered with firebricks laid in place without mortar. Roy Berendsohn, Popular Mechanics, 2 Jan. 2020 Siemens built a new glass furnace with a small network of firebrick tubes. Jonathan Schifman, Popular Mechanics, 9 July 2018 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. Janet Fletcher, San Francisco Chronicle, 17 Jan. 2018

Word History

First Known Use

1749, in the meaning defined above

Time Traveler
The first known use of firebrick was in 1749

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