ἀκρόγωνος
From LSJ
κόραξ δ' ἐπαίνῳ καρδίην ἐχαυνώθη → the flattered crow was filled with pride, the flattered crow became elate in heart
Spanish (DGE)
-ον
angular
1 fig. piedra angular (sc. λίθος) de Cristo Σωτῆρα τὸν ἀκρόγωνον ἐκμιμούμενος Gr.Naz.M.37.1246A.
2 subst. τὸ ἀ. ángulo extremo, límite extremo τῆς ἐπαύλεως PMasp.109.26, cf. 151.113 (ambos VI d.C.).