Definition of "Incendiary" :

noun: a bomb that is designed to start fires; is most effective against flammable targets (such as fuel)

noun: a criminal who illegally sets fire to property

adjective: capable of catching fire spontaneously or causing fires or burning readily

"An incendiary agent."

adjective: arousing to action or rebellion

adjective: involving deliberate burning of property

"An incendiary fire."