WordReference Random House Unabridged Dictionary of American English © 2025
bur′sa of Fabri′cius, [Ornith.]
  1. Birdsa lymphoid gland of the cloaca in birds, believed to function in disease resistance, and closing or disappearing as the bird ages.
  • after Hieronymus Fabricius ab Aquapendente (1537–1619), Italian anatomist, who discovered it


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