Huntington's disease
noun
                                                                                                                            
                                                            Hun·ting·ton's disease
                    
                                                                                                              
                                                                                                                                  ˈhən-tiŋ-tənz-  
                                                      
                                                          
            
            variants  
 or less commonly Huntington disease  
 or Huntington's chorea  
 or Huntington's
        
    
                                
              
          
                                                      : a hereditary brain disorder that is a progressive, neurodegenerative condition marked especially by impairments in thinking and reasoning, disturbances of emotion and behavior, and the involuntary spasmodic movements of chorea and that is associated with the loss or atrophy of nerve cells in the basal ganglia especially of the caudate nucleus and putamen                                      
                
Note: Huntington's disease is inherited as an autosomal dominant trait requiring only one parent to pass on a copy of the defective gene on a chromosome other than a sex chromosome. While it may have an onset at any age, people most often become symptomatic between 30 to 50 years of age. The most common symptoms of Huntington's disease include depression, irritability, mood swings, deficits in memory and concentration, dementia, difficulty in swallowing, jerky movements, and loss of coordination.
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  Merriam-Webster unabridged




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