Definition of virion in English:


Line breaks: vir¦ion
Pronunciation: /ˈvɪrɪɒn


  • The complete, infective form of a virus outside a host cell, with a core of RNA and a capsid.
    More example sentences
    • The humoral arm produces virus-neutralizing antibodies that, when fully effective, completely prevent virions from infecting new host cells.
    • It is probable that movement of poliovirions occurs through the interaction of the virions with the host cell actin similar to the mechanisms seen in some bacterial infections 10-12.
    • However, the tubes may contain multiple virions, or capsids, like peas in a pod, or the linear arrangement of spores in neurospora filaments.


1950s: from virus + -on.

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