IPA: /ˈɛk.təʊ.zoʊ.ən/
KK: /ˈɛktoʊzoʊən/
A type of organism that lives on the surface of another organism, often as a parasite.
The ectozoan attached itself to the fish, feeding on its skin.
Ectozoan is formed from "ecto-" (from Greek "ektos", meaning outside) and "zoan" (from Greek "zoon", meaning animal). The term refers to animals that live outside of a host organism, particularly in a parasitic context.
Think of 'ecto-' meaning 'outside' and 'zoon' meaning 'animal' — this helps you remember that an ectozoan is an animal that lives outside of another organism.