/ Dictionary / Index H heptagonal: Meaning and Definition of Find definitions for: hep•tag•o•nal Pronunciation: (hep-tag'u-nl), [key] — adj. having seven sides or angles. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. heptagon heptahedron Related Content Daily Word Quiz: fabricate Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language