acute or chronic inflammation of a joint, often accompanied by pain and structural changes and having diverse causes, as infection, crystal deposition, or injury.

1535–45; < Neo-Latin < Greek: gout. See arthro-, -itis Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
arthritis (ɑːˈθraɪtɪs)
See also rheumatoid arthritis inflammation of a joint or joints characterized by pain and stiffness of the affected parts, caused by gout, rheumatic fever, etc
[C16: via Latin from Greek: see arthro-, -itis]
usage  Rather than talking about an arthritic or arthritics, it is better to talk about a person with arthritis and people with arthritis
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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Word Origin & History

"inflammation of a joint," 1540s, from L. arthritis, from Gk. nosos arthritis "disease of the joints," from nosos "disease" + arthritis, fem. of arthrites (adj.) "pertaining to joints" (Gk. nosos is a fem. noun), from arthron "a joint" (see arm (1)).
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

arthritis ar·thri·tis (är-thrī'tĭs)
n. pl. ar·thrit·i·des (-thrĭt'ĭ-dēz')
Inflammation of a joint or joints resulting in pain and swelling. Also called articular rheumatism.

ar·thrit'ic (-thrĭt'ĭk) adj. & n.
ar·thrit'i·cal·ly adv.
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
arthritis  [%PREMIUM_LINK%]     (är-thrī'tĭs)  Pronunciation Key 

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Acute or chronic inflammation of one or more joints, usually accompanied by pain and stiffness, resulting from infection, trauma, degenerative changes, autoimmune disease, or other causes. See also osteoarthritis, rheumatoid arthritis.

The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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American Heritage
Cultural Dictionary

arthritis definition

The inflammation of tissues in the joints (such as osteoarthritis and rheumatoid arthritis), usually resulting in pain and stiffness.

The American Heritage® 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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Example sentences
Gout is a kind of arthritis that occurs when uric acid builds up in blood and
  causes joint inflammation.
Synthetic cobra venom is used in pain relievers and arthritis medication.
Drugstore shelves are filled with pills and lineaments to help relieve pain
  from arthritis.
Chronic gouty arthritis is treated with drugs that help reduce uric acid levels.
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