Jisho

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Noun
1. inverted nipple; retracted nippleAnatomy
Wikipedia definition
2. Inverted nippleAn inverted nipple (occasionally invaginated nipple) is a condition where the nipple, instead of pointing outward, is retracted into the breast. In some cases, the nipple will be temporarily protruded if stimulated, but in others, the inversion remains regardless of stimulus. Women and men can have inverted nipples.
Read “Inverted nipple” on English Wikipedia
Read “陥没乳頭” on Japanese Wikipedia
Read “Inverted nipple” on DBpedia

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