flagstone
rock
Quick Summary
Flagstone is a type of hard, evenly stratified rock that splits easily into flat pieces. These pieces are suitable for paving and are often used for walkways, patios, and steps. The term "flagstone" can refer to the rock itself or to a piece of this stone. The adjective "flaggy" describes rock that splits into layers of suitable thickness for flagstones, or soil that contains many pieces of flagstone. The word has been in use since at least 1730.123
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