any of various flat or tapelike worms of the class Cestoidea, lacking an alimentary canal, and parasitic when adult in the alimentary canal of humans and other vertebrates: the larval and adult stages are usually in different hosts.
echinococcus See also taenia any parasitic ribbon-like flatworm of the class Cestoda, having a body divided into many egg-producing segments and lacking a mouth and gut. The adults inhabit the intestines of vertebrates
A worm with a long, flat body that can live in the human intestines as a parasite. Infestation with a tapeworm usually occurs as the result of eating raw meat or fish that contains the immature form of the worm.