/ Dictionary / Index S screw thread: Meaning and Definition of Find definitions for: screw' thread" Pronunciation: [key] Also calledthe helical ridge of a screw. a full turn of the helical ridge of a screw. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. screw propeller screw-top Related Content Daily Word Quiz: crutiny Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language