Webster's English Dictionary

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nipple

nip.ple \'nip-*l\ n [earlier neble, nible, prob. dim. of neb, nib] 1: the 
   protuberance of a mammary gland upon which the ducts open and from w hich 
   milk is drawn 2a: an artificial teat through which a bottle-fed infant 
   nurses  2b: a device with an orifice through which the discharge of a 
   liquid can be  regulated 3a: a protuberance resembling or suggesting the 
   nipple of a breast  3b: a small projection through which oil or grease is 
   injected into machine ry 4: a pipe coupling consisting of a short piece of 
   threaded tubing