'Ectozoon' definitions:

Definition of 'ectozoon'

From: WordNet
noun
Any external parasitic organism (as fleas) [syn: ectoparasite, ectozoan, ectozoon, epizoan, epizoon]

Definition of 'Ectozoon'

From: GCIDE
  • 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]