: a lymphoid organ that opens into the cloaca of birds and functions in B cell production

Word History

Etymology

Johan C. Fabricius †1808 Danish entomologist

First Known Use

1887, in the meaning defined above

Time Traveler
The first known use of bursa of Fabricius was in 1887

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Cite this Entry

“Bursa of Fabricius.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/bursa%20of%20Fabricius. Accessed 28 Feb. 2025.

Medical Definition

bursa of Fabricius

noun
: a blind glandular sac that opens into the cloaca of birds and functions in B cell production

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