coping stone

English Thesaurus

1. a stone that forms the top of wall or building (noun.artifact)

hypernym	:	stone,
definition	:	building material consisting of a piece of rock hewn in a definite shape for a special purpose (noun.artifact)

part meronym	:	wall,
definition	:	an architectural partition with a height and length greater than its thickness; used to divide or enclose an area or to support another structure (noun.artifact)