the world > matter > properties of materials > temperature > heat > burning > [adjective] > setting on fire or alight > incendiary (4)
Consisting in, relating or pertaining to, the malicious setting on fire of buildings or other property.
That starts a fire; esp. that sets fires as a malicious or criminal act. Also: characterized by the setting of fires. Cf. firesetter, n., fire-setting…
Using petroleum for incendiary purposes. Cf. petroleur, n.