ἱππογνώμων
From LSJ
Τὸ μανθάνειν δ' ἥδιστον εὖ λέγοντος, εἰ κέρδος λέγοι → It is the sweetest thing to learn from one speaking well, if they speak profitably
English (LSJ)
ον, gen. ονος,
A judging well of horses: hence generally, quick in judging, τινος A.Fr.243, cf. Hsch.
German (Pape)
[Seite 1259] ονος, pferdekundig, u. übertr., θυμός, übh. kundig, Aesch. frg. 219; vgl. Schol. Soph. Ai. 143.