ἀφηνισμός

From LSJ

ἔργοισι χρηστός, οὐ λόγοις ἔφυν μόνον → a friend in deeds, and not in words alone

Source

Spanish (DGE)

-οῦ, ὁ resistencia a las riendas de caballos, Eust.1071.40.