capstone

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capstone

, copestone
Mountaineering a chockstone occurring at the top of a gully or chimney

Capstone

The top row of stones on a retaining wall; the top stone on a pier or on top of a corbeled vault.

capstone

[′kap‚stōn]
(architecture)
A stone placed at the top of a stone arch.

coping stone, capstone, copestone

coping stone
A stone which forms a coping.

capstone

1. Any single stone in a coping.
2. A stone placed at the top of a stone arch.