PLATYHELMINTH Meaning of PLATYHELMINTH in English [ ˌplatɪ'hɛlmɪnθ ]■ noun Zoology an invertebrate of the order Platyhelminthes; a flatworm.Originfrom mod. L. Platyhelminthes , from platy- + Gk helminth 'worm'. Concise Oxford English vocab. Сжатый оксфордский словарь английского языка. 2004