/ Dictionary / Index B bretylium: Meaning and Definition of Find definitions for: bre•tyl•i•um Pronunciation: (bru-til'ē-um), [key] — n. Pharm. a substance, CHBrNOS, used to treat acute ventricular arrhythmias and suppress ventricular fibrillation. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Bretton Woods Conference Breuer 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