Ascarididae

noun plural

As·​car·​i·​di·​dae ˌas-kə-ˈrid-ə-ˌdē 

: a family of large nematode worms (superfamily Ascaridoidea) that are usually parasitic in the intestines of vertebrates, have three well-developed lips and a simple cylindrical esophagus, and include the common roundworm (Ascaris lumbricoides) parasitic in the human intestine see ascaris