/ Dictionary / Index H heart-lung machine: Meaning and Definition of Find definitions for: heart'-lung' machine" Pronunciation: (härt'lung'), [key] a device through which blood is shunted temporarily for oxygenation during surgery, while the heart or a lung is being repaired. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. heartless heart murmur Related Content Daily Word Quiz: panacea Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language