Definition of wildfire
1
: a sweeping and destructive conflagration especially in a wilderness or a rural area
2
: greek fire
3
: a phosphorescent glow (such as ignis fatuus or fox fire)
4
: a destructive leaf-spot disease of tobacco caused by several strains of a bacterium (Pseudomonas syringae)
like wildfire
: very rapidly
the news spread like wildfire
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Merriam-Webster unabridged
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Time Traveler for wildfire
The first known use of wildfire was in the 12th century
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