zooid Syllabification: (zo·oid)Pronunciation: /ˈzōˌoid/Definition of zooid noun Zoology an animal arising from another by budding or division, especially each of the individuals that make up a colonial organism and typically have different forms and functions. Derivatives zooidalPronunciation: /ˌzōˈoidl/ adjective Origin: mid 19th century: from zoo- 'relating to animals' + -oidzooid in other Oxford dictionaries Definition of zooid in the British & World English dictionary