head·stone /-ˌston/
墓石,基石
Head·stone n.
1. The principal stone in a foundation; the chief or corner stone.
2. The stone at the head of a grave.
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headstone
n 1: the central building block at the top of an arch or vault
[syn: keystone, key]
2: a stone that is used to mark a grave [syn: gravestone, tombstone]