/ Dictionary / Index T threadworm: Meaning and Definition of Find definitions for: thread•worm Pronunciation: (thred'wûrm"), [key] — n. any of various nematode worms, esp. a pinworm. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: threadworm (Thesaurus) thread silk thready Related Content Daily Word Quiz: drowsy Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language