/ Dictionary / Index C clock jack: Meaning and Definition of Find definitions for: clock' jack" Pronunciation: [key] — Horol. Horol. jack (def. 18). Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. clock-hour clocklike Related Content Daily Word Quiz: diaphanous Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language