Murine Breast, Female

**Semantic type:** Body Part, Organ, or Organ Component

**Definition:** breast. 1. The pectoral surface of the thorax. 2. The organ of milk secretion; one of two hemispheric projections of variable size situated in the subcutaneous layer over the pectoralis major muscle on either side of the chest of the mature female; it is rudimentary in the male.

**Synonyms:** - Breast, Female