名詞 nipple:

1. the small projection of a mammary gland
   同義詞：mammilla, mamilla, pap, teat, tit
2. a flexible cap on a baby's feeding bottle or pacifier

nip.ple

n.（名詞）
The small projection near the center of the mammary gland containing the outlets of the milk ducts through which young mammals obtain milk from the adult female; a teat.
乳頭：靠近乳腺中心的小的凸起物，含有乳導管的出口，幼小的哺乳動物從成年雌性身上由此吸取乳汁；乳頭

The rubber cap on a bottle from which a baby nurses.
橡皮乳頭：奶瓶上用于喂嬰兒用的橡皮奶頭
A pacifier for an infant.
嬰兒用的奶嘴
Any of various devices functioning like or resembling a nipple, especially:
似乳頭的東西：任何一種具有類似乳頭功能的器具或設備，尤指：
A regulated opening for discharging a liquid, as in a small stopcock.
水龍頭：用于控制液體排出的開口，如在小的旋塞閥里
A pipe coupling threaded on both ends.
螺紋接頭：一種兩端都帶外螺紋的管子
A short extension of pipe to which a nozzle can be attached.
用于綁縛噴嘴的一節(jié)伸出的短管
A small projection through which grease in a grease gun can be forced into a bearing.
滑油嘴：一個小的突起，通過它滑油槍中的潤滑油能被注入軸承
A natural or geographic projection resembling a nipple, as a mountain crest.
乳頭狀物：類似乳頭的任何自然的或地理上的突起物，如山頂

來源：
From obsolete neble [diminutive of] neb
源自 廢語 neble [] neb的小后綴