antifreeze Syllabification: (an·ti·freeze)Pronunciation: /ˈantiˌfrēz/Translate antifreeze | into German | into Italian | into Spanish Definition of antifreeze noun a liquid, typically one based on ethylene glycol, which can be added to water to lower the freezing point, chiefly used in the radiator of a motor vehicle. antifreeze in other Oxford dictionaries Definition of antifreeze in the British & World English dictionary