Zool. Pl. epizoa. [mod.L., f. Gr. ἐπί + ζῷον animal.] A parasitic animal that lives on the exterior of the body of another animal. Opposed to ENTOZOON.
1836–9. Todd, Cycl. Anat., II. 116/2. The Epizoa, or the external Lernæan parasites of Fishes.
1866. A. Flint, Princ. Med. (1880), 95. Those [parasites] inhabiting the exterior of the body are called epizoa.
1876. Beneden, Anim. Parasites, 35. The Balatro calvus of Claparède, lives as an epizoon.
