ὁμαλόν
From LSJ
Οὗτος Ἰουστῖνον καὶ Νεοβιγάστην στρατηγοὺς προβαλόμενος, καὶ τὰς Βρεττανίας ἐάσας, περαιοῦται ἅμα τῶν αὐτοῦ ἐπὶ Βονωνίαν → He appointed Justinus and Neovigastes as generals, and leaving Britain, crossed with his forces to Bononia.(Olympiodorus/Photius)
Russian (Dvoretsky)
ὁμᾰλόν: τό ровное место, равнина (ἐν τῷ ὁμαλῷ τὴν μάχην ποιεῖσθαι Thuc.).