temporomandibular joint Syllabification: (tem·po·ro·man·dib·u·lar joint)Pronunciation: /ˌtempərōˌmanˈdibyələr/Definition of temporomandibular joint noun Anatomy the hinge joint between the temporal bone and the lower jaw. temporomandibular joint in other Oxford dictionaries Definition of temporomandibular joint in the British & World English dictionary