diaphanometer
noun
                                                                                                                            
                                                            di·aph·a·nom·e·ter
                    
                                                                                                              
                                                                                                                                  dī-ˌaf-ə-ˈnäm-ət-ər 
                                                      
                                                          
            
                                
              
          
                                                      : an instrument for measuring transparency (as of air or liquids)                                      
                
                    
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  Merriam-Webster unabridged




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