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bursa of Fabricius

noun, Ornithology.
a lymphoid gland of the cloaca in birds, believed to function in disease resistance, and closing or disappearing as the bird ages.
Origin of bursa of Fabricius
after Hieronymus Fabricius ab Aquapendente (1537-1619), Italian anatomist, who discovered it Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2017.
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