cy·clo·spor·ine 
(sī′klə-spôrēn, -ĭn) also cy·clo·spor·in (-ĭn) or ci·clo·spor·in
(sī′klə-spôrēn, -ĭn) also cy·clo·spor·in (-ĭn) or ci·clo·spor·inn.
An immunosuppressive drug obtained from the soil fungus Tolypocladium inflatum, used to prevent the rejection of transplanted organs.