Epizoic

Adjective

1. Growing on the surface of an animal host, as: In a nonparasitic way, using an animal's skin as a microhabitat. In a parasitic way, as an external parasite.<!--This sense appears to be outdated.-->
2. In a nonparasitic way, using an animal's skin as a microhabitat.
3. In a parasitic way, as an external parasite.<!--This sense appears to be outdated.-->