a nipple of the mammary gland of a female mammal, from which the milk is sucked by the young (雌性哺乳动物的)乳头 ■(Brit.)a thing resembling this, especially a perforated plastic bulb by which an infant or young animal can suck milk from a bottle (英)橡皮奶头
语源
Middle English (superseding earlier tit): from Old French tete, probably of Germanic origin