/ Dictionary / Index Z ZZZ: Meaning and Definition of Find definitions for: ZZZ Pronunciation: [key] (used to represent the sound of a person snoring.) Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Z-zero particle Related Content Daily Word Quiz: heifer Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language