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osteoporosis

os·te·o·po·ro·sis [ òstee ō pə rṓssiss ]


noun 
Definition:
 
bone disease: a disease occurring especially in women after the menopause in which the bones become very porous, break easily, and heal slowly. It may lead to curvature of the spine after the vertebrae collapse.

[Mid-19th century. <osteo- + Greek poros "passage"]
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