any lymphocyte product, as interferon, that is not an antibody but may participate in the immune response through its effect on the function of other cells, as destroying antigen-coated cells or stimulating macrophages.
lymphokine lym·pho·kine (lĭm'fə-kīn') n. Any of various soluble substances, released by sensitized lymphocytes on contact with specific antigens, that act by stimulating activity of monocytes and macrophages.
(lĭm'fə-kīn') Any of various cytokines released by T cells that have been activated by specific antigens. Lymphokines act as mediators in the immune response by activating macrophages and stimulating lymphocyte production. Interferon is a lymphokine.