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The Simple English Wikipedia has an article on:

Pronunciation

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  • IPA (key): /ˌɒstiəʊpəˈrəʊsɪs/
  • (file)

Singular
osteoporosis

Plural
osteoporoses

  1. (pathology) (usually singular) Osteoporosis is a disease in which the bones become very porous and brittle.