occurring suddenly and with great intensity or severity; fulminating.
Pathology. developing or progressing suddenly: fulminant plague.

1595–1605; < Latin fulminant- (stem of fulmināns), present participle of fulmināre to fulminate; see -ant

unfulminant, adjective
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World English Dictionary
fulminant (ˈfʌlmɪnənt, ˈfʊl-)
1.  sudden and violent; fulminating
2.  pathol (of pain) sudden and sharp; piercing
[C17: from Latin fulmināre to cause lightning, from fulmen lightning that strikes]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

c.1600, from Fr. fulminant or directly from L. fulminantem, prp. of fulminare (see fulminate).
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

fulminant ful·mi·nant (ful'mə-nənt, fŭl'-)
Occurring suddenly, rapidly, and with great severity or intensity, usually of pain.

ful'mi·nat'ing (-nā'tĭng) adj.
The American Heritage® Stedman's Medical Dictionary
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Example sentences
Fulminant acute colitis following a self-administered hydrofluoric acid enema.
Fulminant dengue myocarditis masquerading as acute myocardial infarction.
The fulminant syndrome presents early with encephalopathy and ascites.
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