Definition of bursa of Fabricius in English:

bursa of Fabricius

Syllabification: bur·sa of Fa·bri·ci·us
Pronunciation: /ˌbərsə əv faˈbrēSHəs


  • A glandular sac opening into the cloaca of a bird, producing B cells.
    More example sentences
    • Males with large badges have a smaller bursa of Fabricius than do average males.
    • These drugs prevent development of the bursa of Fabricius and so selectively reduce humoral immunocompetence without influencing macrophages or cell-mediated immunity.
    • Birds that possessed a bursa of Fabricius were classified as young birds in their second or third calendar year.


mid 19th century (in the Latin form bursa Fabricii): from bursa, and a Latinized form of the name of Girolama Fabrici (1533–1619), Italian anatomist.

More definitions of bursa of Fabricius

Definition of bursa of Fabricius in:

Get more from Oxford Dictionaries

Subscribe to remove ads and access premium resources

Word of the day coloratura
Pronunciation: ˌkələrəˈto͝orə
elaborate ornamentation of a vocal melody