thionyl Syllabification: (thi·o·nyl)Pronunciation: /ˈTHīəˌnil/Definition of thionyl noun [as modifier] Chemistry of or denoting the divalent radical =SO. Origin: 1857: so named by Hugo Schiff (1834–1915), German chemistthionyl in other Oxford dictionaries Definition of thionyl in the British & World English dictionary
