tonneau cover
noun
                                
              
          
                                                      : a cover (as of fabric) that protects the unoccupied rear seating compartment of a convertible or roadster                                      
                
                                
            also                
          
                                                      : a lid (as of fabric or aluminum) that covers the bed of a pickup truck                                      
            
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  Merriam-Webster unabridged




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