/ Dictionary / Index B blackheart: Meaning and Definition of Find definitions for: black•heart Pronunciation: (blak'härt"), [key] — n. a nonparasitic disease of plants, as of potatoes and various trees, in which internal plant tissues blacken, usually as a result of extremes in temperature. a heart cherry having a dark skin. the tree bearing this fruit. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: blackheart (Thesaurus) black-headed gull black-hearted 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