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Meaning of bursa of Fabricius

bur'sa of Fabri'cius

Pronunciation: [key]
— Ornith. Ornith.
  1. a lymphoid gland of the cloaca in birds, believed to function in disease resistance, and closing or disappearing as the bird ages.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.