Source : Webster's Revised Unabridged Dictionary (1913)

Platyelminthes \Plat`y*el*min"thes\, n. pl. [NL. See {Platy-},
   and {Helminthes}.] (Zo["o]l.)
   A class of helminthes including the cestodes, or tapeworms,
   the trematodes, and the turbellarians. Called also
   {flatworms}.