nip ‧ ple /ˈnɪp ə l/ BrE AmE noun [countable]
[ Date: 1500-1600 ; Origin: Perhaps from neb , nib 'point' ; ⇨ ↑ nib ]
1 . the small dark circular part of a woman’s breast. Babies suck milk through their mother’s nipples.
2 . one of the two small dark circular parts on a man’s chest
3 . American English the rubber part on a baby’s bottle that a baby sucks milk through SYN teat British English
4 . a 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.