noun Plant Pathology.
a disease of apples, grapes, and other fruit, characterized by cankers on the branches or twigs and bitter, rotted fruit, caused by any of several fungi.
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Origin of bitter rot
An Americanism dating back to 1860–65
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
Examples from the Web for bitter rot
Ripe-rot or bitter-rot (Glomerella rufomaculans) is a disease due to the same fungus causing the bitter-rot of the apple.Manual of American Grape-Growing|U. P. Hedrick