Entry 1 sense Webster, 1913 Ectoparasite · Ec·to·par·a·site · IPA /ˌɛktəˈpɛɹəˌsaɪt/ 01 n. Any parasite which lives on the exterior of animals; -- opposed to endoparasite. 1. Any parasite which lives on the exterior of animals; -- opposed to endoparasite.(Zoöl.)