nipple

n.乳头; 乳头状物品; (机器的)喷嘴

复数：nipples第三人称单数：nipples过去式：nippled

牛津词典

noun

乳头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 .

乳头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 .

乳头状物品；（机器的）喷嘴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油脂喷嘴