18-wheeler
noun
                                                                                                                            
                                                            18-wheel·er
                    
                                                                                                              
                                                                                                                                  ˌā(t)-(ˌ)tēn-ˈwē-lər 
                                                      
                                                          
            
            variants  
 or eighteen-wheeler
        
    
                                
              
          
                                                      : a trucking rig consisting of a tractor and a trailer and typically having eighteen wheels                                      
                
                    
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  Merriam-Webster unabridged




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