μάχιμον

From LSJ

Καὶ τῶν λεγόντων εὖ καλὸν τὸ μανθάνειν → It is a fine thing to learn from those who speak well

Sophocles, Antigone, 722

Russian (Dvoretsky)

μάχῐμον: (ᾰ) τό
1 военное дело Her.;
2 вооруженные силы, войско Thuc.;
3 боевой пыл Plut.