scle ‧ ro ‧ sis /skləˈrəʊsəs, sklɪˈrəʊsəs $ -ˈroʊ-/ BrE AmE noun [uncountable] technical
[ Date: 1300-1400 ; Language: Medieval Latin ; Origin: Greek sklerosis 'hardening' , from skleros 'hard' ]
a disease that causes an organ or soft part of your body to become hard
—sclerotic /skləˈrɒtɪk, sklɪˈrɒtɪk $ -ˈrɑː-/ adjective
⇨ ↑ multiple sclerosis