/ Dictionary / Index H heptavalent: Meaning and Definition of Find definitions for: hep•ta•va•lent Pronunciation: (hep'tu-vā"lunt), [key] — adj. Chem. septivalent. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. heptathlon heptode Related Content Daily Word Quiz: resilient Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language