ἀκροβελής
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)
ές,
A with point at end, AP6.62 (Phil.).
Greek (Liddell-Scott)
ἀκροβελής: -ές, ἔχων ὀξεῖαν αἰχμὴν κατὰ τὸ ἄκρον, Ἀνθ. Π. 6, 62.