Definition of bursa of Fabricius in English:

bursa of Fabricius

Line breaks: bursa of Fab¦ri|cius


  • 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.

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