Added 10 October 2026 platyhelminthes noun Categories: AnimalsRare Words noun ! Definition from WordNet 3.1, Princeton University. More about platyhelminthes at Wordnik → Where our words come from → Flatworms. Related Words: flatwormstaeniidaeascaridaeterebellidaefilariidaenematodapolymastiginamonogeneancestodaphylum Back to today's word