• (n. pl.) A class of helminthes including the cestodes, or tapeworms, the trematodes, and the turbellarians. Called also flatworms.
Plat`y·el·min'thes noun plural [ New Latin See Platy- , and Helminthes .] (Zoology) A class of helminthes including the cestodes, or tapeworms, the trematodes, and the turbellarians. Called also flatworms .