/ Dictionary / Index S screw jack: Meaning and Definition of Find definitions for: screw' jack" Pronunciation: [key] jackscrew. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. screw hook screw log Related Content Daily Word Quiz: pristine Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language