firebrick

[fahyuhr-brik]
noun
a brick made of fire clay.

Origin:
1785–95; fire + brick

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
firebrick (ˈfaɪəˌbrɪk)
 
n
a refractory brick made of fire clay, used for lining furnaces, flues, etc

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Encyclopedia Britannica
Encyclopedia

firebrick

refractory material consisting of nonmetallic minerals formed in a variety of shapes for use at high temperatures, particularly in structures for metallurgical operations and glass manufacturing. Principal raw materials for firebrick include fireclays, mainly hydrated aluminum silicates; minerals of high aluminum oxide content, such as bauxite, diaspore, and kyanite; sources of silica, including sand and quartzite; magnesia minerals, magnesite, dolomite, forsterite, and olivine; chromite, a solid solution of chromic oxide with the oxides of aluminum, iron, and magnesium; carbon as graphite or coke; and vermiculite mica. Minor raw materials are zirconia, zircon, thoria, beryllia, titania, and ceria, and other minerals containing rare-earth elements

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
Only two colours have been used, firebrick and rich pure gold.
Bricklayers also install firebrick linings in industrial furnaces.
All of the furnace stacks still contain vestiges of their firebrick linings.
Portions of the original firebrick inwall still remain.
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