tube worm
noun
                                
              
          
                                                      : a worm that lives in a tube (as one composed of sand grains or calcium carbonate) : such as                                      
                
                    
        a
    
          
                                          
              
          
                                                      : any of various polychaetes or oligochaetes                                      
                
                    
        b(1)
    
                
        (2)
    
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  Merriam-Webster unabridged




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