The mammary alveolus is a structure found in the breasts of lactating females that produces and stores milk. Synonyms for mammary alveolus include milk gland, lactiferous gland, and milk sac. These terms specifically refer to the functional unit of the breast responsible for milk production. Other related terms include lobules, which are small subdivisions of the glandular tissue in the breast, and lactation, the process of producing and secreting milk from the mammary alveoli. Understanding the different terms and synonyms related to the anatomy of the breast can be useful for healthcare professionals working in fields such as obstetrics, gynecology, and lactation consulting.