foundation stone

English Thesaurus

1. a stone laid at a ceremony to mark the founding of a new 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	:	building, edifice,
definition	:	a structure that has a roof and walls and stands more or less permanently in one place (noun.artifact)