Main Entry: in·ter·leu·kin

Pronunciation: \ˌin-tər-ˈlü-kən\

Function: noun

Etymology: inter- + leuk- + ¹-in

Date: 1979

: any of various cytokines of low molecular weight that are produced by lymphocytes, macrophages, and monocytes and that function especially in regulation of the immune system and especially cell-mediated immunity