< /ˌɛk təˈzoʊ ə/. Biology.
- any animal parasite, as the louse, that lives on the surface of its host (opposed to entozoon).
n. pl. ec•to•zo•a (-zō′ə)
- An animal parasite, such as a flea or louse, living on the exterior of the host organism.
< /ˌɛk təˈzoʊ ə/. Biology.
n. pl. ec•to•zo•a (-zō′ə)