The term tapeworm is a type of parasitic flatworm that lives in the intestines of humans and other animals. The scientific name for this organism is TAENIA, which is a genus of the family Taeniidae. Tapeworms are usually contracted by eating undercooked or raw meat, and can cause a variety of symptoms including abdominal pain, nausea, and diarrhea. Treatment typically involves medications to kill the parasite, as well as dietary changes to prevent reinfection.