/ Dictionary / Index O oak gall: Meaning and Definition of Find definitions for: oak' gall" Pronunciation: [key] any of various rounded galls produced on oaks, esp. the horned oak gall. Also called Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Oak Forest Oak Harbor Related Content Daily Word Quiz: spectral Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language