“奶头”在英语中较常见、委婉的说法是 nipple 。这个词既可以指人(尤其是女性)的乳头,也可指动物(如牛、羊等)的乳头。例如:
The baby was sucking on its mother's nipple.(婴儿正在吮吸妈妈的乳头。)
The cow's nipples were full of milk.(奶牛的乳头充满了奶。)