/ Dictionary / Index T thornbush: Meaning and Definition of Find definitions for: thorn•bush Pronunciation: (thôrn'boosh"), [key] — n. any of various shrubs or bushes having spines or thorns. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. thornback Thorndike Related Content Daily Word Quiz: impetuous Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language