remittent
adjective
                                                                                                                            
                                                            re·mit·tent
                    
                                                                                                              
                                                                                                                                  ri-ˈmi-tᵊnt  
                                                      
                                                          
            
        of a disease      
      
                                
                                
              
          
                                                      : marked by alternating periods of abatement and increase of symptoms                                      
              
                             
remittent fever
                         
                
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  Merriam-Webster unabridged




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