1
                    
                                          
              
          
                                                      : the stern of the keel of a ship near the sternpost                                      
                
                                
            especially                
          
                                                      : the part connecting the keel with the bottom of the rudderpost in a single-screw ship                                      
            
            2
                    
                                          
              
          
                                                      : a fin situated on the rear bottom of a surfboard that is used for steering and stability                                      
                
                    
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  Merriam-Webster unabridged




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