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feather rot

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noun Pathology.
a viral disease of birds that causes the feathers to become brittle and break off and the beak and claws to become soft.
a disease of trees caused by a fungus, Poria subacida, and characterized by a spongy or stringy trunk.
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Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2022

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