/ Dictionary / Index T tobacco heart: Meaning and Definition of Find definitions for: tobac'co heart" Pronunciation: [key] — Pathol. Pathol. a functional disorder of the heart, characterized by a rapid and often irregular pulse, caused by excessive use of tobacco. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. tobacco budworm tobacco hornworm Related Content Daily Word Quiz: deleterious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language