Urochordata Syllabification: (Ur·o·chor·da·ta)Pronunciation: /ˌyo͝orəkôrˈdätə, -ˈdātə/ ZoologyDefinition of Urochordata a group of chordate animals that comprises the tunicates. Subphylum Urochordata, phylum Chordata Origin:modern Latin (plural), from uro-2 'tail' + ChordataUrochordata in other Oxford dictionaries Definition of Urochordata in the British & World English dictionary