1. A stone that forms the top of wall or building
   "The masons carefully placed the final copestone atop the garden wall";
   - capstone, coping stone, stretcher
    
2. A final touch; a crowning achievement; a culmination
   "The chef added a sprinkle of fresh herbs as the copestone to the dish";
   - finishing touch, capstone

Derived forms: copestones

Type of: stone, touch

Part of: wall

Encyclopedia: Copestone