an·ti·vi·ral 
(ăn′tē-vīrəl, ăn′tī-)
(ăn′tē-vīrəl, ăn′tī-)adj.
1. Destroying or inhibiting the growth and reproduction of viruses.
2. Computers
a. Of or relating to antivirus software.
b. Eliminating or inhibiting the effectiveness of viruses.
n.
An antiviral drug.