WordNet (r) 3.0 (2006):

endozoan
    adj 1: of or relating to entozoa [syn: entozoan, endozoan]
    n 1: any of various parasites that live in the internal organs
         of animals (especially intestinal worms) [syn:
         endoparasite, entoparasite, entozoan, entozoon,
         endozoan]