1. a type of stone that can withstand high heat, especially flint used to strike sparks
2. a heat-resistant stone used in fireplaces or furnaces

Examples

• The ancient people used firestone to create sparks for starting fires.
• Flint is a common type of firestone found in many regions.
• The blacksmith lined his forge with firestone to withstand the intense heat.
• Firestone was essential for survival in prehistoric times.
• The fireplace was built with special firestone that wouldn’t crack under high temperatures.
• Archaeologists discovered firestone tools at the excavation site.