副ふく乳にゅう

noun

accessory nipple; supernumerary nipple; accessory breast

Medical/anatomical term for an extra nipple or breast tissue along the milk line. Not an everyday word; used in clinical contexts.

• 副ふく乳にゅうは、胎たい児じ期きの乳にゅう腺せん堤ていが完かん全ぜんに退たい縮しゅくしないことで生しょうじる。

  Accessory nipples occur when the embryonic mammary ridge does not fully regress.