ectoparasite Syllabification: (ec·to·par·a·site)Pronunciation: /ˌektəˈparəˌsīt/Definition of ectoparasite noun Biology a parasite, such as a flea, that lives on the outside of its host. Compare with endoparasite.Derivatives ectoparasiticPronunciation: /-ˌparəˈsitik/ adjective ectoparasite in other Oxford dictionaries Definition of ectoparasite in the British & World English dictionary