cornerstone
cor.ner.stone \'ko.(r)-n*r-.sto-n\ n 1: a stone forming a part of a corner or angle in a wall; specif : such a stone laid at a formal ceremony 2: the most basic element : FOUNDATION
cor.ner.stone \'ko.(r)-n*r-.sto-n\ n 1: a stone forming a part of a corner or angle in a wall; specif : such a stone laid at a formal ceremony 2: the most basic element : FOUNDATION