INCENDIARY

I. noun (plural -aries) Etymology: Middle English, from Latin incendiarius, from incendium conflagration, from incendere Date: 15th century 1. a person who commits arson ; arsonist, an ~ agent (as a bomb), a person who excites factions, quarrels, or sedition ; agitator , II. adjective Date: 15th century of, relating to, or involving arson ; arsonous, tending to excite or inflame ; inflammatory , 3. igniting combustible materials spontaneously, of, relating to, or being a weapon (as a bomb) designed to start fires, extremely hot