copestone
/ˈkoʊpˌstoʊn/
noun
- A stone that forms the top of a wall or building; a capstone.
- The mason carefully placed the copestone on the garden wall.
- The old bridge still has its original copestone in place.
- Each pillar was finished with a carved copestone.
- A finishing touch or crowning achievement.
- His latest invention is the copestone of years of research.
- The final chapter serves as a copestone to the entire series.
- Winning the award was the copestone of her career.
Antonyms