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Definition of noble rot
: a botrytis fungus (Botrytis cinerea) that infects various usually overripe wine grapes causing shriveling which results in increased sugar and flavor content and is responsible for the characteristic flavor of sauternes and related wines
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Merriam-Webster unabridgedWords at Play
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Time Traveler for noble rot
The first known use of noble rot was in 1905
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