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The Collaborative International Dictionary of English v.0.48 (gcide)

Nipple \Nip"ple\ (n[i^]p"p'l), n. [Formerly neble, a dim. of
neb. See {Neb}, {Nib}.]
1. (Anat.) The protuberance through which milk is drawn from
the breast or mamma; the mammilla; a teat; a pap.
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2. The orifice at which any animal liquid, as the oil from an
oil bag, is discharged. [R.] --Derham.
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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.
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4. (Mech.) A pipe fitting, consisting of a short piece of
pipe, usually provided with a screw thread at each end,
for connecting two other fittings.
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{Solder nipple}, a short pipe, usually of brass, one end of
which is tapered and adapted for attachment to the end of
a lead pipe by soldering.
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