[nip.ple] n [earlier neble, nible, prob. dim. of neb, nib] (1530) 1: the protuberance of a mammary gland upon which in the female the lactiferous ducts open and from which milk is drawn
2. a: an artificial teat through which a bottle-fed infant nurses b: a device with an orifice through which the discharge of a liquid can be regulated 3 a: a protuberance resembling or suggesting the nipple of a breast b: a small projection through which oil or grease is injected into machinery
4: a pipe coupling consisting of a short piece of threaded tubing -- nip.pled adj