nipplenip‧ple /ˈnɪpəl/ noun [countable] 
1the small dark circular part of a woman’s breast. Babies suck milk through their mother’s nipples.2one of the two small dark circular parts on a man’s chest3American English the rubber part on a baby’s bottle that a baby sucks milk through SYN teat British English4a part in an engine or machine made of rubber or plastic and shaped like a nipple. It has a hole in it which liquid can flow or be poured through.
1the small dark circular part of a woman’s breast. Babies suck milk through their mother’s nipples.2one of the two small dark circular parts on a man’s chest3American English the rubber part on a baby’s bottle that a baby sucks milk through SYN teat British English4a part in an engine or machine made of rubber or plastic and shaped like a nipple. It has a hole in it which liquid can flow or be poured through.