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Definition of nipple
1the 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. the flexible tip of a baby’s pacifier or feeding bottle. 2a small projection on a device or machine, especially one from which oil, grease, or other fluid is dispensed in small amounts. a short section of pipe with a screw thread at each end for coupling.
verb [with object] (usually be nippled)
provide (something) with a projection like a nipple:rocks nippled with limpets