Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. A disease in which the bones become extremely porous, are subject to fracture, and heal slowly, occurring especially in women following menopause and often leading to curvature of the spine from vertebral collapse.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. A disease, occurring especially in women following menopause, in which the bones become extremely porous and are subject to fracture.

from the GNU version of the Collaborative International Dictionary of English

  • n. 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.

from The Century Dictionary and Cyclopedia

  • n. Morbid absorption of bone proceeding from the Haversian canals, so that it becomes abnormally porous.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. abnormal loss of bony tissue resulting in fragile porous bones attributable to a lack of calcium; most common in postmenopausal women

Etymologies

New Latin : osteo- + Greek poros, passage, pore; see pore2 + -osis.
(American Heritage® Dictionary of the English Language, Fourth Edition)
From osteo- +‎ porosis. (Wiktionary)

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