of, pertaining to, or caused by a virus.
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 e-mails: a clever viral ad. See viral marketing.
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 computer virus.
go viral, to spread rapidly via the Internet, e-mail, or other media: Footage of the candidate's off-color remarks went viral within minutes.

1935–40; vir(us) + -al1

antiviral, adjective

viral, virile. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
antiviral (ˌæntɪˈvaɪrəl)
1.  inhibiting the growth of viruses
2.  any antiviral drug: used to treat diseases caused by viruses, such as herpes infections and AIDS

viral (ˈvaɪrəl)
of, relating to, or caused by a virus

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

"of the nature of, or caused by, a virus," 1948, see virus.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

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

an'ti·vi'ral n.

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

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
virus   (vī'rəs)  Pronunciation Key 
Plural viruses
  1. Any of various extremely small, often disease-causing agents consisting of a particle (the virion), containing a segment of RNA or DNA within a protein coat known as a capsid. Viruses are not technically considered living organisms because they are devoid of biological processes (such as metabolism and respiration) and cannot reproduce on their own but require a living cell (of a plant, animal, or bacterium) to make more viruses. Viruses reproduce first either by injecting their genetic material into the host cell or by fully entering the cell and shedding their protein coat. The genetic material may then be incorporated into the cell's own genome or remain in the cytoplasm. Eventually the viral genes instruct the cell to produce new viruses, which often cause the cell to die upon their exit. Rather than being primordial forms of life, viruses probably evolved from rogue pieces of cellular nucleic acids. The common cold, influenza, chickenpox, smallpox, measles, mumps, yellow fever, hemorrhagic fevers, and some cancers are among the diseases caused by viruses.

  2. Computer Science A computer program that duplicates itself in a manner that is harmful to normal computer use. Most viruses work by attaching themselves to another program. The amount of damage varies; viruses may erase all data or do nothing but reproduce themselves.

viral adjective
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
Advances including better nutrition, antiviral medications and vaccines are
  preventing the rapid spread of the illness.
But many anticancer and antiviral drugs are toxic to marrow.
Surveillance systems and antiviral treatments will help contain a disease, but
  they cannot halt it the way a vaccine could.
One way to slow its spread is to treat infected birds with amantadine, an
  antiviral drug meant for humans.
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