DEFERVESCENCE Meaning of DEFERVESCENCE in English [ ˌdɪfə'vɛs(ə)ns ]■ noun Medicine the abatement of a fever.Derivativesdefervesce verb OriginC18: from L. defervescent- , defervescere 'to cease to boil'. Concise Oxford English vocab. Сжатый оксфордский словарь английского языка. 2004