FULMINANT Meaning of FULMINANT in English [ 'fʊlmɪnənt , 'fʌl- ]■ adjective Medicine (of a disease or symptom) severe and sudden in onset.OriginC17: from Fr., or from L. ~- , fulminare (see fulminate ). Concise Oxford English vocab. Сжатый оксфордский словарь английского языка. 2004