/ Dictionary / Index R roundworm: Meaning and Definition of Find definitions for: round•worm Pronunciation: (round'wûrm"), [key] — n. any nematode, esp. Ascaris lumbricoides, that infests the intestine of humans and other mammals. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: roundworm (Thesaurus) round window roup Related Content Daily Word Quiz: panacea Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language