/ ˈnɪpl; NAmE / noun
1.
either of the two small round dark parts on a person's chest. Babies can suck milk from their mother's breasts through the nipples.
—picture at body
2.
( NAmE ) = teat (1)
3.
a small metal, plastic or rubber object that is shaped like a nipple with a small hole in the end, especially one that is used as part of a machine to direct oil, etc. into a particular place :
a grease nipple
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WORD ORIGIN
mid 16th cent. (also as neble , nible ): perhaps a diminutive of neb .