polychaete Syllabification: (pol·y·chaete)Pronunciation: /ˈpälēˌkēt/ (also polychete)Definition of polychaete noun Zoology a marine annelid worm of the class Polychaeta; a bristle worm. adjective relating to or denoting polychaetes. Derivatives polychaetousPronunciation: /ˌpälēˈkētəs/ adjective polychaete in other Oxford dictionaries Definition of polychaete in the British & World English dictionary