ἀλληλομάχοι

From LSJ

ἐν μὲν γὰρ ταῖς ἐπιστολαῖς αὐτοῦ οὐδὲ μνήμην τῆς οἰκείας προσηγορίας ποιεῖται, ἢ πρεσβύτερον ἑαυτὸν ὀνομάζει, οὐδαμοῦ δὲ ἀπόστολον οὐδ' εὐαγγελιστήν (Eusebius, Demonstratio evangelica 3.5.88) → For in his epistles he doesn't even make mention of his own name — or simply calls himself the elder, but nowhere apostle or evangelist.

Source

Greek (Liddell-Scott)

ἀλληλομάχοι: α, οἱ μαχόμενοι πρὸς ἀλλήλους· διωρθώθη κατ’ εἰκασ. ἐν Ἀριστ. Ἱ. Ζ. 9. 1, 26, ἀντὶ ἀλληλοφάγοι.