Webster's Revised Unabridged Dictionary · 1913

Incendiary

Incendiary (?; 277) , noun

[Latin incendiarius: compare French incendiaire. See Incense to inflame.]

1.
Any person who maliciously sets fire to a building or other valuable or other valuable property.
2.
A person who excites or inflames factions, and promotes quarrels or sedition; an agitator; an exciter.
Several cities... drove them out as incendiaries. — Bentley

Incendiary , adjective

[Latin incendiarius, from incendium a fire, conflagration: compare French incendiaire. See Incense to inflame.]

1.
Of or pertaining to incendiarism, or the malicious burning of valuable property; as, incendiary material; as incendiary crime.
2.
Tending to excite or inflame factions, sedition, or quarrel; inflammatory; seditious. — Paley
Collocations (2)
Incendiary device , a device designed to set a structure on fire; a firebomb.
Incendiary shell , a bombshell. See Carcass, 4.