δυωδεκαΐς
From LSJ
εἰ ἀποκρυπτόντων τῶν Μήδων τὸν ἥλιον ὑπὸ σκιῇ ἔσοιτο πρὸς αὐτοὺς ἡ μάχη καὶ οὐκ ἐν ἡλίῳ → if the Medes hid the sun, the battle would be to them in the shade and not in the sun
English (LSJ)
ίδος, Att.; Ion. δωδεκηΐς, ίδος, and δῠωδεκα-ῄς, -ῇδος, ἡ, A sacrifice of twelve victims, SIG2438 D37 (Delph.), SIG3604.9 (Delph., ii B.C.), Porph.Abst.1.22, etc.: as adjective, θυσίαι Eust.1386.48: hence name of a sacred mission to Delphi, SIG773.2 (i B.C.).