1. Plural of fireclay; a type of clay that can withstand high temperatures without melting, used in making bricks, crucibles, and other refractory products.
Usage: technical; material science

Examples

• The kiln was lined with fireclays to prevent heat damage.
• Fireclays are essential materials in the steel industry for furnace construction.
• The pottery studio ordered several tons of fireclays for their high-temperature kilns.
• Fireclays maintain their structural integrity even when exposed to extreme heat.
• Industrial furnaces rely on fireclays to withstand temperatures above 1500 degrees Celsius.