/ Dictionary / Index A atrioventricular bundle,: Meaning and Definition of Find definitions for: a'trioventric'ular bun'dle Pronunciation: [key] — Anat. Anat. a bundle of specialized muscle fibers regulating the heartbeat by conducting impulses from the right atrium to the ventricles. Also called Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. atrioventricular atrioventricular node Related Content Daily Word Quiz: lunar Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language