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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.
Origin
after Hieronymus Fabricius ab Aquapendente (1537-1619), Italian anatomist, who discovered it
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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