1. a heat-resistant brick made of fire clay, used to line furnaces, fireplaces, and ovens

Examples

• The blacksmith lined his forge with firebrick to withstand the intense heat.
• We need to replace the cracked firebrick in the pizza oven.
• The furnace was built using high-quality firebrick that could handle temperatures over 2000 degrees.
• The fireplace repair required several new firebricks for the back wall.
• Industrial kilns are typically constructed with firebrick to prevent heat damage.
• The old firebrick had begun to crumble after years of exposure to extreme temperatures.