coaxial
adjective
                                                                                                                            
                                                            co·ax·i·al
                    
                                                                                                              
                                                                                                                                  (ˌ)kō-ˈak-sē-əl  
                                                      
                                                          
            1
                    
                                          
              
          
                                                      : having coincident axes                                      
                
                    
2
                    
                                          
              
          
                                                      : mounted on concentric shafts                                      
                
                    
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  Merriam-Webster unabridged




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