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thread blight

American  

noun

Plant Pathology.

  1. a fungal disease of woody plants, characterized by thick, threadlike strands of mycelium on the undersides of the leaves and branches.

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.