/ Dictionary / Index H hepta-: Meaning and Definition of Find definitions for: hepta- Pronunciation: [key] a combining form meaning “seven,” used in the formation of compound words: heptahedron. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Hepplewhite heptachlor Related Content Daily Word Quiz: gregarious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language