/ Dictionary / Index P Platyhelminthes: Meaning and Definition of Find definitions for: Plat•y•hel•min•thes Pronunciation: (plat"ē-hel-min'thēz), [key] — n. a phylum of worms having bilateral symmetry and a soft, usually flattened body, comprising the flatworms. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: platyhelminthes (Thesaurus) platyhelminth platykurtic Related Content Daily Word Quiz: jovial Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language