/ Dictionary / Index P platyhelminth: Meaning and Definition of Find definitions for: plat•y•hel•minth Pronunciation: (plat"i-hel'minth), [key] — n. any worm of the phylum Platyhelminthes; a flatworm. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: platyhelminth (Thesaurus) platyfish Platyhelminthes 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