The DICT Development Group

  Helminthes \Hel*min"thes\, n. pl. [NL., fr. Gr. ?, ?, a worm.]
     (Zool.)
     One of the grand divisions or branches of the animal kingdom.
     It is a large group including a vast number of species, most
     of which are parasitic. Called also Enthelminthes,
     Enthelmintha.
     [1913 Webster]
  
     Note: The following classes are included, with others of less
           importance: Cestoidea (tapeworms), Trematodea (flukes,
           etc.), Turbellaria (planarians), Acanthocephala
           (thornheads), Nematoidea (roundworms, trichina,
           gordius), Nemertina (nemerteans). See Plathelminthes,
           and Nemathelminthes.
           [1913 Webster]