/ Dictionary / Index H heart urchin: Meaning and Definition of Find definitions for: heart' ur"chin Pronunciation: [key] an echinoderm of the order Spatangoida, having an elongate, somewhat heart-shaped outer covering. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. heart-to-heart heartwarming Related Content Daily Word Quiz: secular Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language