From Longman Dictionary of Contemporary Englishpetrol bombˈpetrol bomb noun [countable] British EnglishSCB a simple bomb consisting of a bottle filled with petrol and a lighted cloth SYN Molotov cocktail
Examples from the Corpus
petrol bomb• The raiders burst into the dining-room and rolled hand grenades along the floor as a petrol bomb was launched outside.• Another Epworth resident was burned alive a few days earlier when a petrol bomb was thrown into his home. 