adjective

1. having to do with the willful destruction of property by fire
2. causing or designed to cause fires, as certain substances, bombs, etc.
3. willfully stirring up strife, riot, rebellion, etc.

Etymology: L incendiarius, setting on fire, an incendiary < incendium, a fire < incendere: see incense

noun pl. incendiaries -·ar′·ies

1. a person who willfully destroys property by fire
2. a person who willfully stirs up strife, riot, rebellion, etc.
3. an incendiary bomb, substance, etc.