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In its most general form, a nipple is a structure from which a fluid emanates. more specifically, it is the projection on the breasts or udder of a mammal by which breast milk is delivered to a mother's young. in this sense, it is often called a teat, especially when referring to non-humans, and the medical term used to refer to it is papilla. the rubber mouthpiece of a baby bottle or pacifier may also be referred to as a "nipple" or a "teat".