sclerosis
noun /skləˈrəʊsɪs/
/skləˈrəʊsɪs/
[uncountable] (medical)- a condition in which soft tissue in the body becomes hard, in a way that is not normal see also multiple sclerosisWord Originlate Middle English (originally denoting a hard external tumour): via medieval Latin from Greek sklērōsis, from sklēroun ‘harden’.