| Noun | 1. | Trematoda - parasitic flatworms (including flukes)helminth, parasitic worm - worm that is parasitic on the intestines of vertebrates especially roundworms and tapeworms and flukes phylum Platyhelminthes, Platyhelminthes - flatworms trematode, trematode worm, fluke - parasitic flatworms having external suckers for attaching to a host cercaria - tadpole-shaped parasitic larva of a trematode worm; tail disappears in adult stage family Fasciolidae, Fasciolidae - a family of Trematoda family Schistosomatidae, Schistosomatidae - a family of Trematoda class - (biology) a taxonomic group containing one or more orders |