εὐφόρβιον
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)
τό, A spurge, Euphorbia resinifera, Dsc.3.82, Gal.13.270; freq. also, its resinous juice, S.E.P.1.93, Edict.Diocl.32.70.
Greek (Liddell-Scott)
εὐφόρβιον: τό, «δένδρον ἐστὶ ναρθηκοειδὲς Λιβυκόν..., ὀποῦ μεστὸν δριμυτάτου» Διοσκ. 3. 96, Λατ. Euphorbium· ὡσαύτως καὶ ὁ ῥητινώδης ὀπὸς τοῦ φυτοῦ, αὐτόθι.