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

Derived forms: capstones

Type of: stone, touch

Part of: wall

Encyclopedia: Capstone