Noun | 1. | interferon - an antiviral protein produced by cells that have been invaded by a virus; inhibits replication of the virus alpha-interferon - a form of interferon that is produced endogenously and commercially for its pharmacological effects (including regulation of the immune system and antiviral and antineoplastic effects) beta-interferon - a form of interferon that is produced by fibroblasts and have antiviral effects; used in the treatment of multiple sclerosis gamma-interferon - a form of interferon that is produced by T cells and macrophages; involved in the activation of phagocytes |