nipple

柯林斯词典

1. N-COUNT The nipples on someone's body are the two small pieces of slightly hard flesh on their chest. Babies suck milk from their mothers' breasts through their mothers' nipples. 乳头
Sore nipples can inhibit the milk supply. 乳头疼痛可能抑制母乳分泌。
2. N-COUNT A nipple is a piece of rubber or plastic which is attached to the top of a baby's bottle. (橡皮或塑料的) 奶嘴