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



BrE BrE//ˌɒstiəʊpəˈrəʊsɪs//
; NAmE NAmE//ˌɑːstioʊpəˈroʊsɪs//
(also brittle bone disease) [uncountable] (medical)
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a condition in which the bones become weak and are easily broken, usually when people get older or because they do not eat enough of certain substances Word Origin mid 19th cent.: from osteo- ‘bone’ + Greek poros ‘passage, pore’ + -osis.
See the Oxford Advanced American Dictionary entry: osteoporosis