nipple
n
1
(a) small projection on the breast through which a baby sucks its mother's milk (女子的)乳頭, 奶頭.
(b) similar projection on the chest of a human male (男子的)乳頭. Cf 參看 teat. =>illus at human 見human插圖.
2 = teat.
3 thing shaped like a nipple 似乳頭之物
`grease nipples, ie for squirting grease into machinery 油脂噴嘴.