beam weapon
noun
                                
              
          
                                                      : a weapon that uses a beam of energy or radiation (such as a laser beam) to inflict damage                                      
              
                             
Despite this, inventors have envisioned giant superconducting storage rings that could provide huge amounts of power instantaneously for city power grids, or to power military beam weapons for use against ballistic missiles.—
Malcolm W. Browne
                         
                
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  Merriam-Webster unabridged




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