Epizoon
Pronunciation : Ep`i*zo"
Part of Speech : n.;
Etymology : [NL., fr. Gr. (Zo?l.)
Definition : Defn: One of the artificial group of invertebrates of various kinds, which live parasitically upon the exterior of other animals; an ectozo?n. Among them are the lice, ticks, many acari, the lerneans, or fish lice, and other crustaceans.
pl. Epizoa.
Source : Webster's Unabridged Dictionary, 1913