INTERFERON -
Noun: A protein produced by cells infected by a virus, which inhibits the multiplication of the invading viruses. It protects similar cells for several days from infection by the same or other viruses. Some forms of interferon inhibit viral replication and suppress cell proliferation while other forms of interferon activate macrophages and killer T cells . It is also secreted by the T-cells and all other leukocytes to communicate with one another. Interferon is released by T-cells and macrophages to guide Natural Killer cells to a target site.

Latin - inter = between +

Latin - ferir = strike

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