/ ˌɒstiəʊpəˈrəʊsɪs; NAmE ˌɑːstioʊpəˈroʊ-/ (also ˌbrittle ˈbone disease ) noun
[ U ] ( medical ) 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
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WORD ORIGIN
mid 19th cent.: from osteo- bone + Greek poros passage, pore + -osis .