any invertebrate of the phylum Platyhelminthes (the flatworms)
Derived forms
platyhelminthic (ˌplatyhelˈminthic)
adjective
Word origin
C19: from New Latin Platyhelmintha flatworm, from platy- + Greek helmins worm
platyhelminth in American English
(ˌplætəˈhɛlmɪnθ)
noun
any of a phylum (Platyhelminthes) of flat worms with a soft, unsegmented body and a flame cell system, as the planarians, tapeworms, or liver flukes; flatworm