TFLSJἀκρογωνιαῖοςakrogōniaiosGlosscornerstoneἀκρο-γωνιαῖος, α, ον,at the extreme angle, ἀ. λίθος corner foundation-stone, [[ LXX.Isa.28.16, NT.Eph.2.20.] LXX+NT]