Firebomb (noun)

1. An incendiary bomb.
2. An explosive device that is designed to start a fire when it detonates.

Origin:

Mid 20th century: blend of fire and bomb.

Examples:

1. The building was destroyed by a firebomb.
2. The firebomb was thrown through the window of the building.
3. The terrorist group claimed responsibility for the firebombing.
4. The firebomb was made of gasoline and a homemade fuse.
5. The arsonist was caught using a firebomb to start the fire.