benzene Syllabification: (ben·zene)Pronunciation: /ˈbenˌzēn, benˈzēn/Translate benzene | into Italian Definition of benzene noun a colorless volatile liquid hydrocarbon present in coal tar and petroleum, used in chemical synthesis. Its use as a solvent has been reduced because of its carcinogenic properties. Chemical formula: C6H6 Origin: mid 19th century: from benzoin + -enebenzene in other Oxford dictionaries Definition of benzene in the British & World English dictionary