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nipple
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, in females, 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. A breast or nipple is sometimes called a "pap". The rubber mouthpiece of a baby bottle or pacifier may also be referred to as a "nipple" or a "teat". In humans, nipples of both males and females are also one of the erogenous zones. In many cultures, human female nipples are sexualized and it is considered a taboo or a public indecency to uncover them in public.
==Etymology==
The word "nipple" most likely originates as a diminutive of ''neb'', an Old English word meaning "beak", "nose", or "face", and which is of Germanic origin. The words "teat" and "tit" share a Germanic ancestor. The second of the two, tit, was inherited directly from Proto-Germanic, while the first entered English via Old French.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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