/ Dictionary / Index I irritable heart: Meaning and Definition of Find definitions for: ir'ritable heart' Pronunciation: [key] — Pathol. Pathol. See Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. irritable bowel syndrome irritant Related Content Daily Word Quiz: acquiesce Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language