a refractory clay used for making crucibles, firebricks, etc.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
How to use fire clay in a sentence
This mould is then filled with a mixture of one part fire clay, one part ground fire brick and one part fire sand.Oxy-Acetylene Welding and Cutting | Harold P. Manly
The bolts should have a covering of fire-clay to protect them from the action of the fire.
Lute the joint with fire-clay, place the cover on, and bolt it down.
The water is kept from running into the receiver by a ring of damp fire-clay.
Before kindling the furnace, its inner surface is smeared over with a cream-consistenced mixture of fire-clay and water.A Dictionary of Arts, Manufactures and Mines | Andrew Ure
British Dictionary definitions for fire clay
a heat-resistant clay used in the making of firebricks, furnace linings, etc
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012