os·te·o·ar·thri·tis

[os-tee-oh-ahr-thrahy-tis]
noun Pathology.
the most common form of arthritis, usually occurring after middle age, marked by chronic breakdown of cartilage in the joints leading to pain, stiffness, and swelling.
Also called degenerative joint disease.


Origin:
1875–80; osteo- + arthritis

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
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Collins
World English Dictionary
osteoarthritis (ˌɒstɪəʊɑːˈθraɪtɪs) [Click for IPA pronunciation guide]
 
n
Also called: degenerative joint disease chronic inflammation of the joints, esp those that bear weight, with pain and stiffness
 
osteoarthritic
 
adj, —n

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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00:10
Osteoarthritis has a plethora of syllables.
So is floccinaucinihilipilification. Does it mean:
the estimation of something as valueless (encountered mainly as an example of one of the longest words in the English language).
opposition to the withdrawal of state support or recognition from an established church, esp. the Anglican Church in 19th-century England.
American Heritage
Medical Dictionary

osteoarthritis os·te·o·ar·thri·tis (ŏs'tē-ō-är-thrī'tĭs)
n.
A form of arthritis, occurring mainly in older persons, that is characterized by chronic degeneration of the cartilage of the joints. Also called degenerative joint disease, hypertrophic arthritis, osteoarthrosis.


os'te·o·ar·thrit'ic (-thrĭt'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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American Heritage
Science Dictionary
osteoarthritis   (ŏs'tē-ō-är-thrī'tĭs)  Pronunciation Key 
A form of arthritis, occurring mainly in older people, that is characterized by chronic degeneration of the cartilage of the joints.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
Arthritic conditions, particularly osteoarthritis and gout, can cause foot pain.
Mao says he next wants to test the procedure in goats, which are a better model
  for human osteoarthritis than rabbits.
Usually, it is only when their knees become painful that people go to see a
  doctor and osteoarthritis is diagnosed.
The increased body weight itself causes problems that result in injury and
  diseases, including osteoarthritis and sleep apnea.
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