fire clay

a refractory clay used for making crucibles, firebricks, etc.

1810–20 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
fire clay
a heat-resistant clay used in the making of firebricks, furnace linings, 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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Example sentences
Supplies needed include a commercially available low fire clay and a kiln.
The mixing, packing, wheeling and tempering of mortar and fire clay.
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