electronegative Syllabification: (e·lec·tro·neg·a·tive)Pronunciation: /iˌlektrəˈnegətiv/Definition of electronegative adjective 1 Physics electrically negative. 2 Chemistry (of an element) tending to acquire electrons and form negative ions in chemical reactions. Derivatives electronegativityPronunciation: /iˌlektrōˌnegəˈtivitē, ēˈˌlektrōˌnegəˈtivədē/ noun electronegative (sense 2).electronegative in other Oxford dictionaries Definition of electronegative in the British & World English dictionary