/ Dictionary / Index H heart murmur: Meaning and Definition of Find definitions for: heart' mur"mur Pronunciation: [key] — Med. Med. murmur (def. 3). Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. heart-lung machine Heart of Darkness* Related Content Daily Word Quiz: tactful Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language