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

coping stone, capstone, copestone

coping stone
A stone which forms a coping.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.
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Carefully remove the copestones and place them in a line about 9 feet away, arranging them on edge, roughly how they'll be placed back on the wall.
For small erections may be finished by their first architects; grand ones, true ones, ever leave the copestone to posterity.
32) and there will never be a copestone. Many will continue to ponder the novel and refer to it later in the term.
Another trainee, Simon Copestone, feared for his safety after being drawn into the contest.