medullated
adjective
                                                                                                                            
                                                            med·ul·lat·ed
                    
                                                                                                              
                                                                                                                                  ˈme-də-ˌlā-təd  
                                                                                                                              
            ˈme-jə-
                                                      
                                                          1
                    
                                of a nerve fiber 
                                  
              
          
                                                      : myelinated                                      
                
                    
2
                    
                                of a hair or wool fiber 
                                  
              
          
                                                      : having a hollow space within the cortex (see cortex sense 1a(2))                                      
                
                    
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  Merriam-Webster unabridged




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