Definition of nipple

Reference

nip·ple

l) KEY

NOUN:

1. 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.
2. A corresponding projection of the male breast.
1. The rubber cap on a bottle from which a baby nurses.
2. A pacifier for an infant.
Any of various devices functioning like or resembling a nipple, especially:
1. A regulated opening for discharging a liquid, as in a small stopcock.
2. A pipe coupling threaded on both ends.
3. A short extension of pipe to which a nozzle can be attached.
4. 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.

ETYMOLOGY:
From obsolete neble, diminutive of neb

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