Etymology
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firebomb (n.)

also fire-bomb, 1895 (earlier as a type of fireworks and a type of cannonball), from fire (n.) + bomb (n.). As a verb, from 1950 as an act of vandalism or terrorism, from 1941 as a military aviation tactic. Related: Firebombed; firebombing.

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Definitions of firebomb
1
firebomb (v.)
attack with incendiary bombs;
2
firebomb (n.)
a bomb that is designed to start fires; is most effective against flammable targets (such as fuel);
Synonyms: incendiary bomb / incendiary
From wordnet.princeton.edu