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The Collaborative International Dictionary of English v.0.48:

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]