electrochemistry Syllabification: (e·lec·tro·chem·is·try)Pronunciation: /iˌlektrōˈkemistrē/Definition of electrochemistry noun the branch of chemistry that deals with the relations between electrical and chemical phenomena. Derivatives electrochemicalPronunciation: /-ˈkemikəl/ adjective electrochemicallyPronunciation: /-ˈkemik(ə)lē/ adverb electrochemist noun electrochemistry in other Oxford dictionaries Definition of electrochemistry in the British & World English dictionary