LSJ
ὁ, name of a month, at Argos, Mnemos. 44.51; at Epidaurus, IG (1).117.9, al. ; at Megara, ib. 7.188; at Thespiae, ib. 1720; — also written Πάνεμος (Boeot.), Plu. Cam. 19; Πάνημος, D. 18.157 (Corinth.), Call. Epigr. 46, IG 11(2).203 A 31 (Delos, iii BC), PCair. Zen. 20.5 (iii BC); — hence Πανάμια, τά, festival at Thespiae, Schwyzer 491.11.
Liddell-Scott-Jones, Greek-English Lexicon (9th ed., 1940)