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nip·ple
 (n  p   l)
KEY
NOUN:
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- 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.
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- 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.
ETYMOLOGY:
From obsolete neble, diminutive of
neb
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