Ēp′i-zō′ōn, n.

n.; pl. Ēp′i-zō′ā. [Gr. ἐπί, on, and ζῷον, animal.] (Zoöl.) One of a class of parasitic insects or worms that live upon other animals, such as lice, acari, the parasitic crustaceans found on fishes and other water animals, and the like;—opposed to entozoön. Dana.