radioscopy
noun
                                                                                                                            
                                                            ra·di·os·co·py
                    
                                                                                                              
                                                                                                                                  ˌrād-ē-ˈäs-kə-pē  
                                                      
                                                          
            
            
               plural radioscopies            
        
    
                                
              
          
                                                      : direct observation of objects opaque to light by means of some other form of radiant energy (as X-rays)                                      
                
                    
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  Merriam-Webster unabridged




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