τρίπλεθρος
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)
ον,
A three πλέθρα wide, Pl.Criti.115d, X.An.5.6.9, Inscr.Cret.1. v 21 (Arcades, ii B. C.).
German (Pape)
[Seite 1145] drei πλέθρα lang; Plat. Critia. 115 ό; Xen. An. 5, 6, 9.
Greek (Liddell-Scott)
τρίπλεθρος: -ον, ὁ ἔχων εὖρος τριῶν πλέθρων, Πλάτ. Κριτί. 115D, Ξεν. Ἀν. 5. 6, 9· διάστημα τρ. Διόδ. 17, 7.