atomic bomb
noun
1
                    
                                          
              
          
                                                      : a bomb whose violent explosive power is due to the sudden release of energy resulting from the splitting of nuclei of a heavy chemical element (such as plutonium or uranium) by neutrons in a very rapid chain reaction                                      
                
called also atom bomb
2
                    
                                          
              
          
                                                      : a nuclear weapon (such as a hydrogen bomb)                                      
                
                    
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  Merriam-Webster unabridged




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