hypothenar eminence
noun
                                                                                                                            
                                                            hy·po·the·nar eminence
                    
                                                                                                              
                                                                                                                                  ˌhī-pō-ˈthē-ˌnär- 
                                                                                                                                  -nər-; hī-ˈpäth-ə-ˌnär- 
                                                                                                                              
            -nər-
                                                      
                                                          
                                
              
          
                                                      : the prominent part of the palm of the hand above the base of the little finger                                      
                
                    
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  Merriam-Webster unabridged




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