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bursa of Fabricius

noun Ornithology.
  1. a lymphoid gland of the cloaca in birds, believed to function in disease resistance, and closing or disappearing as the bird ages.
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Origin of bursa of Fabricius

after Hieronymus Fabricius ab Aquapendente (1537–1619), Italian anatomist, who discovered it
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018