Antiviral

of, relating to, or caused by a .
pertaining to or involving the spreading of information and opinions about a product or service from person to person, especially on the Internet or in emails:
a clever viral ad.
See also .
becoming very popular by circulating quickly from person to person, especially through the Internet: the most memorable viral videos;
This book is already viral two weeks before its official publication date.
pertaining to a .
go viral, to spread rapidly via the Internet, email, or other media:
Footage of the candidate’s off-color remarks went viral within minutes.
Contemporary Examples

A low count spelled serious trouble, whereas high and stable numbers were seen in those with a good response to antiviral drugs.
New Thai-Taiwanese Syndrome Is Not AIDS 2.0 Kent Sepkowitz August 25, 2012

Historical Examples

It proved resistant to every one of the antibiotics and antiviral agents in the Lancet’s stockroom.
Star Surgeon Alan Nourse

adjective
inhibiting the growth of viruses
noun
any antiviral drug: used to treat diseases caused by viruses, such as herpes infections and AIDS
adjective
of, relating to, or caused by a virus
(of a video, image, story, etc) spread quickly and widely among internet users via social networking sites, e-mail, etc
adj.

“of the nature of, or caused by, a virus,” 1948, see virus.

antiviral an·ti·vi·ral (ān’tē-vī’rəl, ān’tī-)
adj.
Destroying or inhibiting the growth and reproduction of viruses.
an’ti·vi’ral n.

viral vi·ral (vī’rəl)
adj.
Of, relating to, or caused by a virus.