/ Dictionary / Index B B.R.T.: Meaning and Definition of Find definitions for: B.R.T. Pronunciation: [key] Brotherhood of Railroad Trainmen. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Br. Som. Bruant Related Content Daily Word Quiz: secular Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language