os·te·o·po·ro·sis /ˌɑstiopəˈrosəs/
  骨質疏鬆症
  os·teo·po·ro·sis /ˌɑstɪopəˈrosəs/ 名詞
  骨質疏鬆(症),骨質疏鬆症
  Os·te·o·po·ro·sis n.  Med. & Physiol. An absorption of bone so that the bone tissue becomes unusually porous.  It occurs especially in elderly men and postmenopausal women, and predisposes the elderly to fractures of the bones.
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  osteoporosis
       n : abnormal loss of bony tissue resulting in fragile porous
           bones attributable to a lack of calcium; most common in
           postmenopausal women