/ Dictionary / Index P pinworm: Meaning and Definition of Find definitions for: pin•worm Pronunciation: (pin'wûrm"), [key] — n. a small nematode worm, Enterobius vermicularis, infesting the intestine and migrating to the rectum and anus, esp. in children. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: pinworm (Thesaurus) pinwork pin wrench Related Content Daily Word Quiz: careening Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language