/ Dictionary / Index F flatworm: Meaning and Definition of Find definitions for: flat•worm Pronunciation: (flat'wûrm"), [key] — n. any worm of the phylum Platyhelminthes, having bilateral symmetry and a soft, solid, usually flattened body, including the planarians, tapeworms, and trematodes; platyhelminth. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: flatworm (Thesaurus) flatwork Flaubert Related Content Daily Word Quiz: feline Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language