ballista
noun
                                                                                                                            
                                                            bal·lis·ta
                    
                                                                                                              
                                                                                                                                  bə-ˈli-stə 
                                                      
                                                          
            
            
               plural ballistae
                                        bə-ˈli-ˌstē 
    
            
        
    
                                
              
          
                                                      : an ancient military engine often in the form of a crossbow for hurling large missiles                                      
                
                    
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  Merriam-Webster unabridged




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