From The Collaborative International Dictionary of English v.0.48 [gcide]:
3. Any small projection or article in which there is an orifice for discharging a fluid, or for other purposes; as, the nipple of a nursing bottle; the nipple of a percussion lock, or that part on which the cap is put and through which the fire passes to the charge.
From WordNet (r) 3.0 (2006) [wn]:
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