Definition of nipple noun from the Oxford Advanced American Dictionary

     

    nipple

     noun
    noun
    NAmE//ˈnɪpl//
     
     
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  1. 1either of the two small, round, dark parts on a person's chest. Babies can suck milk from their mother's breasts through the nipples.
  2. 2 the rubber part at the end of a baby's bottle that the baby sucks in order to get milk, etc. from the bottle
  3. 3a 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
See the Oxford Advanced Learner's Dictionary entry: nipple