/ Dictionary / Index T thread blight: Meaning and Definition of Find definitions for: thread' blight" Pronunciation: [key] — Plant Pathol. Plant Pathol. a fungal disease of woody plants, characterized by thick, threadlike strands of mycelium on the undersides of the leaves and branches. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. threadbare threaded Related Content Daily Word Quiz: immense Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language