umbilical cord
noun
1
                    
        a
    
          
                                          
              
          
                                                      : a cord arising from the navel that connects the fetus with the placenta and through which respiratory gases, nutrients, and wastes pass                                      
                
                    
        b
    
          2
                    
                                          
              
          
                                                      : a tethering or supply line (as for an astronaut outside a spacecraft or a diver underwater)                                      
                
                    
3
                    
                                          
              
          
                                                      : a necessary, supportive, or nurturing link or connection                                      
                
                    
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  Merriam-Webster unabridged




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