(plural-a) see quot. [ < ecto-comb. form + -zooncomb. form, after French ectozoaire (1829 or earlier).]
ΚΠ
1860 R. G. MayneExpos. Lexicon Med. Sci.Ectozoon, a general term for those parasitic insects..that infest the surface, or external part of the body, in distinction from the Entozoa.