/ Dictionary / Index B bull gun: Meaning and Definition of Find definitions for: bull' gun" Pronunciation: [key] a target rifle with a heavy barrel. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. bull gear bullhead Related Content Daily Word Quiz: cetacean Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language