firebombPronunciation: /ˈfʌɪəbɒm/Translate firebomb | into French | into German | into Italian Definition of firebomb noun a bomb designed to cause a fire: [as modifier]:a firebomb attack verb [with object] attack or destroy with a firebomb:two bookshops and a newspaper office have been firebombedfirebomb in other Oxford dictionaries Definition of firebomb in the US English dictionary