: one that is a year old: such as                                      
                
                    
        a
    
          
                                          
              
          
                                                      : an animal one year old or in the second year of its age                                      
                
                    
        b
    
          
                                          
              
          
                                                      : a racehorse between January 1 of the year after the year in which it was foaled and the next January 1                                      
                
                    
                                                      yearling
                                      adjective
                                                                            
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  Merriam-Webster unabridged




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