headstone

名词 headstone:

1. the central building block at the top of an arch or vault
   同义词：keystone, key
2. a stone that is used to mark a grave
   同义词：gravestone, tombstone

head.stone

n.（名词）
A memorial stone set at the head of a grave.
墓石：竖在墓前的纪念性石碑
Also head stone Architecture See keystone
也作 head stone 【建筑学】 参见 keystone