capstone

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capstone

, copestone
Mountaineering a chockstone occurring at the top of a gully or chimney
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005

Capstone

The top row of stones on a retaining wall; the top stone on a pier or on top of a corbeled vault.
Illustrated Dictionary of Architecture Copyright © 2012, 2002, 1998 by The McGraw-Hill Companies, Inc. All rights reserved

capstone

[′kap‚stōn]
(architecture)
A stone placed at the top of a stone arch.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

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.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.