From Longman Dictionary of Contemporary Englishanti-virus softwareˌanti-ˈvirus ˌsoftware (also anti-virus program) noun [uncountable] a type of software that looks for and removes viruses in programs and documents on your computer You need to update your anti-virus software regularly.
Examples from the Corpus
anti-virus software• These aren't really a type of virus; the name merely describes their extraordinary ability to hide from anti-virus software.• Better yet, purchase and install a good anti-virus software program.• Use a good anti-virus software program and update it regularly.• One maker of anti-virus software estimated that as few as 60 hard drives were affected worldwide on Aug. 22.• To their credit, some of the larger producers of anti-virus software gently downplayed the Hare threat. 