stereopticon
noun
                                                                                                                            
                                                            ste·re·op·ti·con
                    
                                                                                                              
                                                                                                                                  ˌster-ē-ˈäp-ti-kən 
                                                                                                                              
            ˌstir-
                                                      
                                                          1
                    
                                          
              
          
                                                      : a projector for transparent slides often made double so as to produce dissolving views                                      
                
                    
2
                    
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  Merriam-Webster unabridged




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