a fully grown female animal of a domesticated breed of ox, used as a source of milk or beef 母牛;奶牛;乳牛。 见 cattle a dairy cow. 一头乳牛。 ■(loosely) a domestic bovine animal, regardless of sex or age (泛指)牛 ■(in farming) a female domestic bovine animal which has borne more than one calf (畜牧)(已生了几头小牛的)母牛。 比较 heifer ■the female of certain other large animals, for example elephant, rhinoceros, whale, seal, or reindeer (大型)母兽(如大象、犀牛、鲸、海豹、驯鹿等)