/ Dictionary / Index H heirdom: Meaning and Definition of Find definitions for: heir•dom Pronunciation: (âr'dum), [key] — n. heirship; inheritance. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. heir at law heiress Related Content Daily Word Quiz: placid Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language