Definitions for virionˈvaɪ riˌɒn, ˈvɪr i-
Random House Webster's College Dictionary
vi•ri•onˈvaɪ riˌɒn, ˈvɪr i-(n.)
the infectious form of a virus as it exists outside the host cell, consisting of a core of DNA or RNA, a protein coat, and, in some species, an external envelope.
Origin of virion:
1960–65; < F virion (1959) =viri(en) viral (see virus , -ian ) +-on -on1
(virology) a complete viral particle; nucleic acid and capsid (and a lipid envelope in some viruses)
A single individual particle of a virus (the viral equivalent of a cell).
U.S. National Library of Medicine
The infective system of a virus, composed of the viral genome, a protein core, and a protein coat called a capsid, which may be naked or enclosed in a lipoprotein envelope called the peplos.