thymoma
noun
                                                                                                                            
                                                            thy·mo·ma
                    
                                                                                                              
                                                                                                                                  thī-ˈmō-mə  
                                                      
                                                          
            
            
               plural thymomas also thymomata
                                        -mət-ə  
    
            
        
    
                                
              
          
                                                      : a tumor that arises from the tissue elements of the thymus                                      
                
                    
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  Merriam-Webster unabridged




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