/'nɪpl; `nɪpl/
n
1 (a) small projection on the breast through which a baby sucks its mother's milk （女子的）乳头, 奶头.
(b) similar projection on the chest of a human male （男子的）乳头. Cf 参看 teat. =>illus at human 见human插图.
2 = teat.
3 thing shaped like a nipple 似乳头之物
*`grease nipples, ie for squirting grease into machinery 油脂喷嘴.

n[C]
[Date: 1500-1600; Origin: Perhaps from neb, nib 'point'; NIB]
the small dark circular part of a woman's breast. Babies suck milk through their mother's nipples.
one of the two small dark circular parts on a man's chest
AmE the rubber part on a baby's bottle that a baby sucks milk through
British Equivalent: teat
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.