ectozoon

from WordNet (r) 3.0 (2006)
ectozoon
    n 1: any external parasitic organism (as fleas) [syn:
         {ectoparasite}, {ectozoan}, {ectozoon}, {epizoan},
         {epizoon}]
from The Collaborative International Dictionary of English v.0.48
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]
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