The Collaborative International Dictionary of English v.0.48:
endozoic \en`do*zo"ic\ ([e^]n`d[-o]*z[=o]"[i^]k), adj. Living within a living animal, usually as a parasite; as, endozoic worms. Contrasted with epizoic. Syn: entozoic, entozoan. [WordNet 1.5]WordNet (r) 3.0 (2006):
endozoic adj 1: living within a living animal usually as a parasite; "entozoic worms" [syn: entozoic, entozoan, endozoic] [ant: epizoic]