copestone

名词 copestone:

1. a final touch; a crowning achievement; a culmination
   同义词：finishing touch, capstone
2. a stone that forms the top of wall or building
   同义词：capstone, coping stone, stretcher

cope.stone

n.（名词）
A capstone.
盖顶石

来源：
cope 2
cope2
stone
stone