electroconvulsive Syllabification: (e·lec·tro·con·vul·sive)Pronunciation: /iˌlektrōkənˈvəlsiv/Definition of electroconvulsive adjective of or relating to the treatment of mental illness by the application of electric shocks to the brain. electroconvulsive in other Oxford dictionaries Definition of electroconvulsive in the British & World English dictionary