‖Ep′i‐zo″ön (?), n.; pl.Epizoa (#). [NL., fr. Gr. επἴ upon + ζῳ̑ον animal.] (Zoöl.) 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.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.