• An epizoic organism.
  • One of the <em>Epizoa</em>; an epizoan.
  • One of the artificial group of invertebrates of various kinds, which live parasitically upon the exterior of other animals; an ectozoön. Among them are the lice, ticks, many acari, the lerneans, or fish lice, and other crustaceans.
  • An <xref>external</xref> <xref>animal</xref> <xref>parasite</xref>
  • any external parasitic organism (as fleas)
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