diffraction
noun
                                                                                                                            
                                                            dif·frac·tion
                    
                                                                                                              
                                                                                                                                  di-ˈfrak-shən 
                                                      
                                                          
            
                                
              
          
                                                      : a modification which light undergoes especially in passing by the edges of opaque bodies or through narrow openings and in which the rays appear to be deflected                                      
                
                                
            also                
          
                                                      : a similar modification of other waves (such as sound waves) or of moving particles (such as electrons)                                      
            
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  Merriam-Webster unabridged




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