Meaning of NIPPLE in English
1》 the small projection in which the mammary ducts of female mammals terminate and from which milk can be secreted.
↘the corresponding vestigial structure in a male.
↘ N. Amer. the teat of a feeding bottle.
2》 a small projection on a machine, especially one from which oil or other fluid is dispensed.
↘a short section of pipe with a screw thread at each end for coupling.
C16 (also as neble , nible ): perh. a dimin. of neb .
Concise Oxford English vocab. Сжатый оксфордский словарь английского языка. 2004