αἰπύκερως
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
Greek (Liddell-Scott)
αἰπύκερως: -ων, γεν. -ω, = ὑψίκερως, Ἐτυμ. Μ. 37. 38, Σουΐδ.
Spanish (DGE)
-ων
de altísimos cuernos, ἔλαφος Babr.Dact.3, cf. EMα 537, Et.Gen.α 232, Et.Sym.α 301, Theognost.Can.14.