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The Collaborative International Dictionary
Ectozoon

Ectozoon \Ec`to*zo"["o]n\, n.; pl. Ectozoa. [NL., fr. Gr. 'ekto`s outside outside + zw^,on an animal.] (Zo["o]l.) See Epizo["o]n. [1913 Webster] ||

Wiktionary
ectozoon

n. (context zoology English) An epizoon.

WordNet
ectozoon

n. any external parasitic organism (as fleas) [syn: ectoparasite, ectozoan, epizoan, epizoon]