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 sclerosis硬化;硬化症 词源late Middle English (originally denoting a hard external tumour): via medieval Latin from Greek sklērōsis, from sklēroun ‘harden’.