A stone or brick used as the coping, forming the protective cap along the top edge of a wall or fence.
Compound of 'coping' (from Old French 'couper') and 'stone' (from Proto-Germanic), describing the actual material used as the protective top layer.
Coping stones shaped at specific angles have protected buildings for centuries—some medieval coping stones from castle walls have survived hundreds of years because water runs off them rather than pooling and freezing.
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