The small projection near the center of the mammary gland containing the outlets of the milk ducts through which young mammals obtain milk from the adult female; a teat.
A corresponding projection of the male breast.
The rubber cap on a bottle from which a baby nurses.
A pacifier for an infant.
Any of various devices functioning like or resembling a nipple, especially:
A regulated opening for discharging a liquid, as in a small stopcock.
A pipe coupling threaded on both ends.
A short extension of pipe to which a nozzle can be attached.
A small projection through which grease in a grease gun can be forced into a bearing.
A natural or geographic projection resembling a nipple, as a mountain crest.