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[os-tee-oh-puh-roh-sis] /ˌɒs ti oʊ pəˈroʊ sɪs/
noun, Pathology.
a disorder in which the bones become increasingly porous, brittle, and subject to fracture, owing to loss of calcium and other mineral components, sometimes resulting in pain, decreased height, and skeletal deformities: common in older persons, primarily postmenopausal women, but also associated with long-term steroid therapy and certain endocrine disorders.
Origin of osteoporosis
1840-50; osteo- + Greek pór(os) passage, pore2 + -osis Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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Examples from the Web for osteoporosis
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  • It is probable that if this work is confirmed a somewhat similar causative factor will be discovered for osteoporosis.

    Special Report on Diseases of the Horse United States Department of Agriculture
British Dictionary definitions for osteoporosis


porosity and brittleness of the bones due to loss of calcium from the bone matrix
Derived Forms
osteoporotic, adjective
Word Origin
C19: from osteo- + pore² + -osis
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for osteoporosis

1846, from osteo- + stem of Greek poros "passage, pore, voyage" (see pore (n.)) + -osis. Related: Osteoporotic.

Online Etymology Dictionary, © 2010 Douglas Harper
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osteoporosis in Medicine

osteoporosis os·te·o·po·ro·sis (ŏs'tē-ō-pə-rō'sĭs)
n. pl. os·te·o·po·ro·ses (-sēz)
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.

os'te·o·po·rot'ic (-rŏt'ĭk) adj.
The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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osteoporosis in Science
A bone disease characterized by decrease in bone mass and density, resulting in a predisposition to fractures and bone deformities such as the collapse of one or more vertebrae. It occurs most commonly in women after menopause as a result of estrogen deficiency. Calcium supplementation and weight-bearing exercise are used to treat and prevent osteoporosis.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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osteoporosis in Culture
osteoporosis [(os-tee-oh-puh-roh-sis)]

A softening of the bones that gradually increases and makes them more fragile. It is caused by the gradual loss of the mineral calcium, which helps make bones hard. Osteoporosis occurs most often in elderly women.

Note: Many experts now believe that osteoporosis can be prevented through regular exercise, mineral supplements, and a diet high in calcium.
The New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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