ὁμαλόν

Russian (Dvoretsky)

ὁμᾰλόν: τό ровное место, равнина (ἐν τῷ ὁμαλῷ τὴν μάχην ποιεῖσθαι Thuc.).

Lexicon Thucydideum

planities, plain, flat country, 5.65.4, 5.65.6, 6.101.1, 6.101.3. 7.44.8.
planissimus, very flat, 4.31.2.