/ Dictionary / Index H heartwood: Meaning and Definition of Find definitions for: heart•wood Pronunciation: (härt'wood"), [key] — n. the hard central wood of the trunk of an exogenous tree; duramen. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: heartwood (Thesaurus) heart-whole heartworm Related Content Daily Word Quiz: paradox Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language