/ Dictionary / Index H hyzone: Meaning and Definition of Find definitions for: hy•zone Pronunciation: (hī'zōn), [key] — n. Chem. triatomic hydrogen, H. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. hythergraph Hz Related Content Daily Word Quiz: pundit Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language