deaerate Syllabification: (de·aer·ate)Pronunciation: /dēˈe(ə)rāt/Definition of deaerate verb [with object] (usually be deaerated) partially or completely remove dissolved air from (something):the electrolyte was deaerated by purging it with argonDerivatives deaerationPronunciation: /ˌdē-erˈāSHən/ noun deaerate in other Oxford dictionaries Definition of deaerate in the British & World English dictionary