athyreosis
noun
                                                                                                                            
                                                            athy·re·o·sis
                    
                                                                                                              
                                                                                                                                  ˌā-ˌthī-rē-ˈō-səs 
                                                      
                                                          
            
            
               plural athyreoses
                                        -ˌsēz 
    
            
        
    
                                
              
          
                                                      : an abnormal condition caused by absence or functional deficiency of the thyroid gland                                      
                
                    
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  Merriam-Webster unabridged




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