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antivirus any software program designed to identify, thwart, and eliminate computer viruses and other malicious software programs. [2 definitions]
computer virus a code inserted into a host program that can attach itself to and seriously damage other programs, including a computer's system.
filterable virus a virus capable of passing through bacteria-retaining filters and thus remaining infectious.
human immunodeficiency virus the retrovirus that causes the disease AIDS by infecting and destroying T cells in the immune system; HIV.
poliovirus any of three strains of enterovirus that causes poliomyelitis.