WordReference Random House Unabridged Dictionary of American English © 2020
bursa of Fabricius, [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


Report an inappropriate ad.