an·ti·vi·ral
| \ ˌan-tē-ˈvī-rəl
, ˌan-tī-\
1
medical
: acting, effective, or directed against viruses
an antiviral vaccine/drug
2
: used to protect a computer from viruses : antivirus
antiviral software
: an antiviral agent and especially a drug
antivirals used in treating influenza