ergometer
noun
                                                                                                                            
                                                            er·gom·e·ter
                    
                                                                                                              
                                                                                                                                  (ˌ)ər-ˈgä-mə-tər  
                                                      
                                                          
            
                                
              
          
                                                      : an apparatus for measuring the work performed (as by a person exercising)                                      
                
                                
            also                
          
                                                      : an exercise machine equipped with an ergometer                                      
            
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  Merriam-Webster unabridged




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