trifoliate orange
noun
                                
              
          
                                                      : a thorny Chinese tree (Poncirus trifoliata) of the rue family related to the citruses that has trifoliolate leaves and a sour yellow fruit resembling a small orange and that is grown for ornament or hedges or used as a rootstock for citrus fruits                                      
                
                    
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  Merriam-Webster unabridged




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