εὐπάξ
From LSJ
οὕτως εἴη ἡμίν ὁ Θεός βοηθός καὶ τὸ ἱερὸν Αὐτοῦ Εὐαγγέλιον ὧδε ἐμφανισθέντα-ὁρκισθέντα → so help us God and Ηis holy Gospel the things here declared and sworn
English (LSJ)
ᾶγος, ὁ, ἡ, Dor. for εὐπηγής, εὐπᾶγι κύκλῳ cj. for εὐπαγεῖ, E. Or.1428 (lyr.).
Greek (Liddell-Scott)
εὐπάξ: ᾶγος, ὁ, ἡ, Δωρ. ἀντὶ εὐπήξ, εὐπᾶγι κύκλῳ, ἐκ διορθώσεως τοῦ Ἑρμάννου ἀντὶ εὐπαγεῖ ἐν Εὐρ. Ὀρ. 1428.