feline leukemia virus
noun
                                
              
          
                                                      : a retrovirus (species Feline leukemia virus of the genus Gammaretrovirus) that is widespread in cat populations, is usually transmitted by direct contact, and is associated with or causes a variety of conditions and symptoms including malignant lymphoma, feline leukemia, anemia, glomerulonephritis, infertility, and immunosuppression                                      
                
                    
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  Merriam-Webster unabridged




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