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epizoon (n.)

"parasitic animal on the surface or in the skin of another," 1836, from epi- "on" + Greek zōon "animal" (from PIE root *gwei- "to live").

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Definitions of epizoon from WordNet

epizoon (n.)
any external parasitic organism (as fleas);
Synonyms: ectoparasite / ectozoan / ectozoon / epizoan
From wordnet.princeton.edu