μόνιππος
From LSJ
ἐν τῷ θέρει τὴν χλαῖναν κατατρίβων → wearing out one's cloak in summertime
English (LSJ)
ὁ,
A single horse, riding-horse, opp. chariot-horse, X.Cyr. 6.4.1, Pl.Lg.834c, GDI4833 (Cyrene), cf. Paus.Gr.Fr.259. II as Adj., μ. ἱππεῖς Poll.1.141.