internal-combustion engineBrE /ɪnˌtɜːnl kəmˈbʌstʃən endʒɪn/ 🔊NAmE /ɪnˌtɜːrnl kəmˈbʌstʃən endʒɪn/ 🔊 nouna type of engine used in most cars that produces power by burning petrol/gas or other fuel inside 内燃机