Virion

noun
1.
the infectious form of a virus as it exists outside the host cell, consisting of a nucleic acid core, a protein coat, and, in some species, an external envelope.
noun
1.
a virus in infective form, consisting of an RNA particle within a protein covering

virion vi·ri·on (vī’rē-ŏn’, vēr’ē-)
n.
A complete viral particle, consisting of RNA or DNA surrounded by a protein shell and constituting the infective form of a virus.
virion
(vī’rē-ŏn’, vîr’ē-)
A complete viral particle, consisting of RNA or DNA surrounded by a protein shell and constituting the infective form of a virus. The shell, called a capsid, protects the interior core that includes the genome and other proteins. After the virion binds to the surface of a specific host cell, its DNA or RNA is injected into the host cell and viral replication occurs with eventual spread of the infection to other host cells.