/ Dictionary / Index H Hz: Meaning and Definition of Find definitions for: Hz Pronunciation: [key] Hertz; hertzes. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: hz (Thesaurus) hyzone I, i 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