| A | B |
| Alveoli | smallest structure of the mammary gland |
| Areola | darkened area surrounding nipple |
| Colostrum | thin, yellow fluid, precursor of milk, secreted a few days after birth |
| Cooper's ligaments | suspensory ligaments that attach to chest wall |
| Fibroadenoma | rapidly growing benign breast mass - usually solitary and nontender |
| Gynecomastia | excessive breast development in the male |
| Inverted nipples | nipples that are depressed / invaginated |
| Intraductal papilloma | lesions of tiny tumors - usually unpalpable - that cause a serosanguineous discharge |
| Lactiferus | conveying milk |
| Mastitis | inflammation of the breast |
| Montgomery's glands | sebaceous glands in the areola that secrete protective lipids during lactation |
| Paget's disease | intraductal carcinoma of breast - usually manifested by dry scaling crusts at nipple area |
| Peau d'orange | orange peel appearance of breast due to edema - suggestive of cancer |
| Retraction | dimple or pucker in breast skin - suggestive of cancer |
| Striae | atrophic pink, purple, or white linear streaks in skin (stretch marks) |
| Supernumerary nipple | extra nipple (smaller than normal) along the embryonic milk line |
| Tail of Spence | extension of breast tissue at upper outer quadrant where most breast cancers are located |
| Galactorrhea | lactation not associated with childbirth |
| Thelarche | beginning of female breast development |
| Fibrocystic breast disease | benign breast masses with associated tenderness - symptoms usually wax and wane with hormonal cycles |