amelanotic
adjective
                                                                                                                            
                                                            amel·a·not·ic
                    
                                                                                                              
                                                                                                                                  ˌā-ˌmēl-ə-ˈnät-ik  
                                                      
                                                          
            
                                
              
          
                                                      : containing little or no melanin : lacking pigmentation                                      
              
                             
amelanotic melanocytes
                                       amelanotic melanoma
                         
                
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  Merriam-Webster unabridged




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