Definition of virion
: a complete virus particle that consists of an RNA or DNA core with a protein coat sometimes with external envelopes and that is the extracellular infective form of a virus
Recent Examples of virion from the Web
This undated electron microscope image made available by the Centers for Disease Control and Prevention shows human immunodeficiency virus particles (virions).
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Origin and Etymology of virion
French, from virien viral (from virus virus) + -on 2-on
First Known Use: 1959See Words from the same year
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