bolometer
noun
                                                                                                                            
                                                            bo·lom·e·ter
                    
                                                                                                              
                                                                                                                                  bō-ˈlä-mə-tər 
                                                      
                                                          
            
                                
              
          
                                                      : a very sensitive thermometer whose electrical resistance varies with temperature and which is used in the detection and measurement of feeble thermal radiation and is especially adapted to the study of infrared spectra                                      
                
                    
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  Merriam-Webster unabridged




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