/ Dictionary / Index S screwworm: Meaning and Definition of Find definitions for: screw•worm Pronunciation: (skr'wûrm"), [key] — n. the larva of any of certain flies of the genus Callitroga, which sometimes infests wounds and the nose and navel of domestic animals and humans. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. screwup screwworm fly 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