1530s, nyppell, "teat, duct-laden extremity of a mammalian breast," alteration of neble (1520s), probably diminutive of neb "bill, beak, snout" (see neb), hence, literally "a small projection." In reference to an artificial device on an infant's bottle, from 1875. A 16c.-17c. slang term for a woman's nipples was cherrilets.
权威例句
1. Strict adherence to nipple hygiene is essential during breast feeding.
在哺乳期要严格保持乳头的清洁卫生.
2. The nipple is surrounded by pigmented circular skin called the areola.
乳头周围颜色较深的部位称为乳晕.
3. Nipple inversion is quite common in normal breasts.
乳头内陷在正常乳房中也很常见.
4. Feeding time should last as long as the same amount was fed by nipple.
喂的时间应与婴儿从奶头吸吮同等量所需要的时间相等.
5. This unique form of breast cancer begins as a weeping eczematoid lesion of the nipple.