Probably from the base of bosko; an ox (as grazing), i.e. An animal of that species ("beef") -- ox.

see GREEK bosko

βόας (boas) − 2 Occurrences

βοῦν (boun) − 3 Occurrences

βοῦς (bous) − 1 Occurrence

βοῶν (boōn) − 2 Occurrences