Either of two milk-secreting, glandular organs on the chest of a woman; the human mammary gland.

1. A corresponding organ in other mammals.
2. A corresponding rudimentary gland in the male.

1.  
   1. The superior ventral surface of the human body, extending from the neck to the abdomen.
   2. A corresponding part in other animals.
2. The part of a garment that covers the chest.
3. The seat of affection and emotion: “Griefs of mine own lie heavy in my breast” (Shakespeare).
4. A source of nourishment.
5. Something likened to the human breast: the breast of a hill.