Hel·min·thes n. pl. 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.
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.
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