- a flat stone forming part of a coping.；the highest stone in a building, wall, or structure.
noun: coping stone, plural noun: coping stones
- 1. British a flat stone forming part of a coping.
- ▪ British the highest stone in a building, wall, or structure.
- ▪ British a finishing touch or crowning achievement the coping stone in Rattle's Birmingham plans was the completion in 1991 of the Symphony Hall