/ Dictionary / Index O oak wilt: Meaning and Definition of Find definitions for: oak' wilt" Pronunciation: [key] — Plant Pathol. Plant Pathol. a disease of oaks, characterized by wilting and discoloration of the leaves and defoliation, usually starting at and spreading from the top of the tree and the ends of the branches, caused by a fungus, Chalara quercina. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. oak wax scale O and O Related Content Daily Word Quiz: ontiguous Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language