trichloroethylene Syllabification: (tri·chlo·ro·eth·yl·ene)Pronunciation: /trīˌklôrōˈeTHəˌlēn/Definition of trichloroethylene noun Chemistry a colorless volatile liquid used as a solvent and formerly as an anesthetic. Chemical formula: CCl2CHCl trichloroethylene in other Oxford dictionaries Definition of trichloroethylene in the British & World English dictionary