Occurring suddenly, with lightning-like rapidity, and with great intensity or severity; applied to certain pains, e.g., those of tabes dorsalis. Cf.:fulgurant. [L. fulmino, pp. -atus, to hurl lightning, fr. fulmen, lightning]
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ful·mi·nant 'fu̇l-mə-nənt, 'fəl- adj coming on suddenly with great severity <\fulminant hepatitis with total hepatocyte necrosis (C. L. Humberston )(et al)>
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ful·mi·nant (fulґmĭ-nənt) [L. fulminare to flare up] sudden, severe; occurring suddenly and with great intensity.Medical dictionary. 2011.