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bursa of Fabricius Syllabification: bur·sa of Fa·bri·ci·us
Pronunciation: /ˌbərsə əv fəˈbriSH(ē)əs/

Definition of bursa of Fabricius in English:


A glandular sac opening into the cloaca of a bird, producing B cells.
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.

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