urochordate Syllabification: (u·ro·chor·date)Pronunciation: /ˌyo͝orəˈkôrdət, -ˌdāt/ ZoologyDefinition of urochordate noun a marine invertebrate of the group Urochordata, which comprises the tunicates. adjective relating to or denoting urochordates. urochordate in other Oxford dictionaries Definition of urochordate in the British & World English dictionary