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Meaning of bull's-eye rot

bull's'-eye rot"

Pronunciation: [key]
— Plant Pathol. Plant Pathol.
  1. a disease of apples and pears, characterized by sunken, eyelike spots on the fruit and twig cankers, caused by any of several fungi, esp. of the genus Neofabraea.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.