noun
a female domestic bovine animal (i.e. a cow in the broad sense) that has not borne a calf, or has borne only one calf. Often contrasted with
COW1 in the stricter sense.
（未生育过或只生过一头小牛的）母牛（常在更严格意义上常与
COW1相对）。
词源
Old English heahfore, of unknown origin.