Definition of osteoporosis noun from the Oxford Advanced American Dictionary

 

osteoporosis

 noun
noun
NAmE//ˌɑstioʊpəˈroʊsəs//
 
(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
See the Oxford Advanced Learner's Dictionary entry: osteoporosis