/ Dictionary / Index B bullhorn: Meaning and Definition of Find definitions for: bull•horn Pronunciation: (bool'hôrn"), [key] — n. a directional, high-powered, electrical loudspeaker or megaphone. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: bullhorn (Thesaurus) bull header bullion Related Content Daily Word Quiz: pundit Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language