Etymology
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wildfire (n.)

late Old English wilde fyr "destructive fire" (perhaps caused by lightning); also "erysipelas, spreading skin disease;" see wild (adj.) + fire (n.). From c. 1300 as "Greek fire," also fire rained down from the sky as divine retribution. Figurative sense from late 14c. By 1795 as "sheet lightning."

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Definitions of wildfire

wildfire (n.)
a raging and rapidly spreading conflagration;
From wordnet.princeton.edu