a bull (= a male cow) that has been castrated (= had part of its sex organs removed), used, especially in the past, for pulling farm equipment, etc. （阉割的）公牛；犍牛 - (old-fashioned)
any cow or bull on a farm 饲养的牛
Word OriginOld English oxa, of Germanic origin; related to Dutch os and German Ochse, from an Indo-European root shared by Sanskrit ukṣán ‘bull’.