/ Dictionary / Index B bullmastiff: Meaning and Definition of Find definitions for: bull•mas•tiff Pronunciation: (bool'mas'tif, -mä'stif), [key] — n. one of an English breed of dogs having a short, fawn or brindled coat, produced by crossing the bulldog and the mastiff. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Bullitt Bull Moose Related Content Daily Word Quiz: endear Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language