1
                    
                                          
              
          
                                                      : a round bulging vessel of greater length than breadth that is usually made of staves bound with hoops and has flat ends of equal diameter                                      
                
                    
2
                    
        a
    
          
                                          
              
          
                                                      : the amount contained in a barrel                                      
                
                                
            especially                
          
                                                      : the amount (such as 31 gallons of fermented beverage or 42 gallons of petroleum) fixed for a certain commodity used as a unit of measure                                      
            
            
        b
    
          
                                          
              
          
                                                      : a great quantity                                      
                
                    
3
                    
                                          
              
          
                                                      : a drum or cylindrical part: such as                                      
                
                    
        a
    
          
                                          
              
          
                                                      : the discharging tube of a gun                                      
                
                    
        b
    
          
                                          
              
          
                                                      : the part of a fountain pen or of a pencil containing the ink or lead                                      
                
                    
        c
    
          
                                          
              
          
                                                      : a cylindrical or tapering housing containing the optical components of a photographic-lens system and the iris diaphragm                                      
                
                    
        d
    
          
                                          
              
          
                                                      : the fuel outlet from the carburetor on a gasoline engine                                      
                
                    
        e
    
          
                                          
              
          
                                                      : the flat, cylindrical metal box that encloses the mainspring of a timepiece                                      
                
                    
4
                    
                                          
              
          
                                                      : the trunk of a quadruped                                      
                
                    
            
              barreled or barrelled; barreling or barrelling            
        
    
                                
              
          
                                                      : to put or pack in a barrel                                      
                
                    
                                
              
          
                                                      : to move at a high speed or without hesitation                                      
                
                    
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  Merriam-Webster unabridged




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