nipple

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.