au·to·im·mune 
(ô′tō-ĭ-myn)
(ô′tō-ĭ-myn)adj.
Of, relating to, or resulting from an immune response by the body against an antigen in its own cells or tissues: an autoimmune reaction; an autoimmune disorder.
au′to·im·muni·ty n.
au′to·im′mu·ni·zation (-ĭm′yə-nə-zāshən) n.