The Collaborative International Dictionary of English v.0.48:
Epizoan \Ep`i*zo"an\, n. (Zo["o]l.) An epizo["o]n. [1913 Webster]WordNet (r) 3.0 (2006):
epizoan adj 1: of or relating to epizoa [syn: epizoan, ectozoan] n 1: any external parasitic organism (as fleas) [syn: ectoparasite, ectozoan, ectozoon, epizoan, epizoon]