Akademik

a chronic progressive nervous disorder involving loss of myelin sheath around certain nerve fibers (Freq. 2)

noun [noncount]

medical : a disease of the nervous system that causes the gradual loss of muscle control — abbr. MS

ˌmultiple scleˈrosis [multiple sclerosis] noun uncountable (abbr. MS)

a disease of the nervous system that gets worse over a period of time with loss of feeling and loss of control of movement and speech