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

coping stone, capstone, copestone

coping stone
A stone which forms a coping.
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During the dry stone wall taster sessions attendees were taught everything from dismantling, laying foundation stones, through stones, building stone and filling, and then laying the copestones - the pieces of rock shaped for the purpose - on the very top.
Nor is it, altogether, the remembrance of her cathedral-toppling earthquakes; nor the stampedoes of her frantic seas; nor the tearlessness of arid skies that never rain; nor the sight of her wide field of leaning spires, wrenched copestones, and crosses all adroop (like canted yards of anchored fleets); and her suburban avenues of house-walls lying over upon each other, as a tossed pack of cards;--it is not these things alone which make tearless Lima, the strangest, saddest city thou can'st see.