כּוֹי, Koy, (prob.) a kind of bearded dear or antelope (τραγέλαφος). [The rabbis leave it undecided whether K. belongs to the genus of cattle (בְּהֵמָה) or beasts of chase (חַיָּה).] Y. Bicc. II, end, 65ᵇ, v. עִיזָּה. Ḥull. 80ᵃ (various opinions). Tosef. ib. VI (V), 1. Tosef. Bekh. II, 9; a. fr.