Akademik

fire clay
a refractory clay used for making crucibles, firebricks, etc.
[1810-20]

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fire clay noun
A clay poor in lime and iron, suitable for making fire-resistant pottery and firebricks
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Main Entry:fire

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fire clay,
a clay capable of resisting high temperatures, used for making crucibles, firebricks, etc.

Useful english dictionary. 2012.