LSJ
ῶνος, ὁ, name of a month, answering to Att. Pyanepsion, CIG 3661 (Cyzicus), IPE 1². 47 (Olbia); — written ἀπατμιών IG 11.203A 32, 53 (Delos, iii BC), ib. 12(5).824.33 (Tenos), SIG 169.1 (Iasus); Ἀπατοριών IG 12(7).412 (Amorgos, iii BC).
Liddell-Scott-Jones, Greek-English Lexicon (9th ed., 1940)