teat
/tiːt/noun
1- 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。
1.1
- 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。
词源
Middle English （superseding earlier TIT2）： from Old French tete, probably of Germanic origin.