/ Dictionary / Index H heptahedron: Meaning and Definition of Find definitions for: hep•ta•he•dron Pronunciation: (hep"tu-hē'drun), [key] — pl. -drons, -dra a solid figure having seven faces. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. heptagonal heptahydrate 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