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virion

vi·ri·on [ vree òn, vree òn ] (plural vi·ri·ons)


noun 
Definition:
 
infectious virus: the form taken by a virus when it is outside living cells and capable of causing infection. It consists of a core of DNA or RNA surrounded by a protein coat, sometimes covered by an outer envelope.

[Mid-20th century. < French< virien "viral" + -on1]
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