Definition of acinus in English:

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Pronunciation: /ˈasənəs/

noun (plural acini /-ˌnī/)

1A small saclike cavity in a gland, surrounded by secretory cells.
Example sentences
  • The mass also contained cystic spaces lined by columnar epithelium, sebaceous glands, cartilage, smooth muscle, and pancreatic acini.
  • Small residual ducts and islands of intact salivary gland acini predominantly composed of serous-type glandular epithelium were present.
  • The airway wall is composed of many interrelated structural components such as epithelium, connective tissue, vessels, muscle, and mucus-secreting gland acini.
2A region of the lung supplied with air from one of the terminal bronchioles.
Example sentences
  • Primary bronchiolar disorders are separated from diseases primarily affecting more distal components of the pulmonary acinus and large airway diseases in which prominent secondary bronchiolar changes may be seen.
  • A spectrum of airborne organic particulate matter, appropriately sized to reach pulmonary acini, produces this disease.
  • Emphysema is classified into three subtypes based on the portion of the acinus that is involved.



Example sentences
  • However, the extent to which such results are applicable to acinar cells is not clear.
  • The granulomatous process exclusively affected the small airways in an acinar distribution.
  • What collagen is present is usually found associated with the acinar pattern.


Mid 18th century: Latin, literally 'a kernel'.

For editors and proofreaders

Syllabification: ac·i·nus

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