Oncornavirus Definition
 ŏn-kôrnə-vīrəs, ŏng- 
    noun
  
 Any of a group of viruses that contain single-stranded RNA and cause cancers in birds and mammals.
 American Heritage Medicine 
Origin of Oncornavirus
-  Greek onkos mass, tumor oncology RNA virus From American Heritage Dictionary of the English Language, 5th Edition 
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