incendiary
adjective
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capable of catching fire spontaneously or causing fires or burning readily“an incendiary agent”
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arousing to action or rebellionseditiousinflammatoryincitiveinstigativerabble-rousing
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involving deliberate burning of property“an incendiary fire”
noun
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a bomb that is designed to start firesincendiary bombfirebomb
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a criminal who illegally sets fire to propertyfirebug