coping stone

Noun
  1. A stone that forms the top of wall or building (synset 102960863)
    is a type of: stone - building material consisting of a piece of rock hewn in a definite shape for a special purpose
    is a part of: wall - an architectural partition with a height and length greater than its thickness; used to divide or enclose an area or to support another structure
    same as: capstone, copestone, stretcher

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