/ Dictionary / Index H hexavalent: Meaning and Definition of Find definitions for: hex•a•va•lent Pronunciation: (hek'su-vā"lunt), [key] — adj. Chem. having a valence of six. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Hexateuch hexokinase Related Content Daily Word Quiz: agitated Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language