Skip to definition.  Noun: multiple sclerosis  'múl-tu-pul
skli'row-sis   1. A chronic progressive nervous disorder
involving loss of myelin sheath around certain nerve fibers
- MS, disseminated sclerosis, disseminated multiple sclerosis
Type of: autoimmune disease, autoimmune disorder, degenerative
disorder, induration, sclerosis  Encyclopedia: Multiple
sclerosis