- a protuberance of the mamma or breast where, in the female, the milk ducts discharge; teat.
- something resembling it, as the mouthpiece of a nursing bottle or pacifier.
- a short piece of pipe with threads on each end, used for joining valves.
- the small conical projection in the centre of the areola of each breast, which in women contains the outlet of the milk ducts
- something resembling a nipple in shape or function
- a small drilled bush, usually screwed into a bearing, through which grease is introduced
- US and Canadian an informal word for dummy (def. 11)
