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Definition of brittle bone disease noun from the Oxford Advanced Learner's Dictionary

brittle bone disease

noun
 
/ˌbrɪtl ˈbəʊn dɪziːz/
 
/ˌbrɪtl ˈbəʊn dɪziːz/
[uncountable] (medical)
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  1. a rare disease in which somebody’s bones break extremely easily
  2. (also osteoporosis)
    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 brittle bone disease in the Oxford Advanced American Dictionary

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