Strong's G204 — ἀκρογωνιαῖος (adjective)
akrogoniaios (ak-roh-gow-nee-ai`-os) adj.
1. belonging to the extreme corner
[from G206 and G1137]
KJV: chief corner 
Root(s): G206, G1137 
Hebrew root: γωνία
Occurrences: 2