missing link
noun
1
                    
                                          
              
          
                                                      : an absent member needed to complete a series or resolve a problem                                      
                
                    
2
                    
        a
    
          
                                          
              
          
                                                      : a hypothetical intermediate evolutionary form between humans and their presumed simian progenitors                                      
                
                    
        b
    
          
                                          
              
          
                                                      : a hypothetical intermediate evolutionary form between one animal species or group and its presumed ancestors                                      
              
                             
a missing link between reptiles and birds
                         
                
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  Merriam-Webster unabridged




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