Definition of sclerosis noun from the Oxford Advanced Learner's Dictionary

 

sclerosis

 noun
noun
BrE BrE//skləˈrəʊsɪs//
 
; NAmE NAmE//skləˈroʊsɪs//
 
[uncountable](medical)
 
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a condition in which soft tissue in the body becomes hard, in a way that is not normal see also multiple sclerosis Word Origin late Middle English (originally denoting a hard external tumour): via medieval Latin from Greek sklērōsis, from sklēroun ‘harden’.
See the Oxford Advanced American Dictionary entry: sclerosis

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