<p><strong>Adjective</strong></p><ul><li>(of a drug or therapy) developed to effectively treat an infection caused by a virus.</li><li>of or relating to a substance used to prevent or treat a viral infection: Raw garlic has been found to have antiviral properties.</li><li>(of software) programmed to detect, neutralize, and remove computer viruses.</li></ul><p><strong>Noun</strong></p><ul><li>an antiviral drug, other substance, or therapy.</li></ul>