ἵππος, ὁ, a horse
A that goes with the neck arched, X.Eq.7.10.
κῡφᾰγωγὸς: ἵππος, ὁ, βαδίζων μὲ αὐχένα κυρτόν, καμαρωτὸν καὶ τὴν κεφαλὴν κύπτουσαν πρὸς τὰ κάτω, Ξεν. Ἱππ. 7, 10.