Definition of virion in English:

Share this entry


Pronunciation: /ˈvɪrɪɒn/


The complete, infective form of a virus outside a host cell, with a core of RNA and a capsid.
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.

For editors and proofreaders

Line breaks: vir¦ion

Share this entry

What do you find interesting about this word or phrase?

Comments that don't adhere to our Community Guidelines may be moderated or removed.