epizoic Syllabification: (ep·i·zo·ic)Pronunciation: /ˌepiˈzō-ik/Definition of epizoic adjective Biology (of a plant or animal) growing or living nonparasitically on the exterior of a living animal. Derivatives epizoitePronunciation: /ˌepiˈzō-īt/ noun Origin: mid 19th century: from epi- 'upon' + Greek zōion 'animal' + -icepizoic in other Oxford dictionaries Definition of epizoic in the British & World English dictionary