Virion Definition
 vīrē-ŏn, vîrē- 
    noun
  
 The complete, mature, infectious form of a virus when it is outside a host cell.
 Webster's New World 
Other Word Forms of Virion
Noun
Singular:
 virionPlural:
 virionsOrigin of Virion
- vir(us) –on - From American Heritage Dictionary of the English Language, 5th Edition 
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