dysraphism
noun
                                                                                                                            
                                                            dys·ra·phism
                    
                                                                                                              
                                                                                                                                  dis-ˈrā-ˌfiz-əm, ˈdis-rə- 
                                                      
                                                          
            
                                
              
          
                                                      : incomplete fusion of parts                                      
                
                                
            especially                
          
                                                      : defective closure of the neural tube                                       
              
                             
            spinal dysraphism    
                         
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  Merriam-Webster unabridged




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