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(anatomy) The projection of a mammary gland from which, on female therian mammals, milk is secreted.
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The nipple (definition 1) and the areola together.
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A mechanical device through which liquids or gases can be passed in a regulated manner.
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An artificial nipple (definition 1) used for bottle-feeding infants.
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Any small physical protrusion, such as the lumps on the F and J keys on computer keyboards.
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Any small physical protrusion on an automotive, a machine part or any other part that fits into a groove on another part.
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(now chiefly historical) A perforated segment that fits into part of the breech of a muzzle-loading gun, on which the percussion cap is fixed.
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(plumbing, chiefly US) A short tube threaded at both ends, used as a connector.
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(cycling) An internally threaded piece which holds a bicycle spoke in place on the rim.
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(computing, humorous) A pointing stick.