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-itis

1.
a suffix used in pathological terms that denote inflammation of an organ (bronchitis; gastritis; neuritis) and hence, in extended senses, nouns denoting abnormal states or conditions, excesses, tendencies, obsessions, etc. (telephonitis; baseballitis).
Origin
< Neo-Latin (or Latin) -ītis < Greek
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for -itis

-itis

suffix
1.
indicating inflammation of a specified part: tonsillitis
2.
(informal) indicating a preoccupation with or imaginary condition of illness caused by: computeritis, telephonitis
Word Origin
New Latin, from Greek, feminine of -itēs belonging to; see -ite1
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 -itis

noun suffix denoting diseases characterized by inflammation, Modern Latin, from Greek -itis, feminine of adjectival suffix -ites "pertaining to." Feminine because it was used with feminine noun nosos "disease," especially in Greek arthritis (nosos) "(disease) of the joints," which was one of the earliest borrowings into English and from which the suffix was abstracted in other uses.

Online Etymology Dictionary, © 2010 Douglas Harper
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-itis in Medicine

-itis suff.
Inflammation or disease of: laryngitis.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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-itis in Science
-itis  
A suffix meaning "inflammation," as in bronchitis, inflammation of the bronchial tubes.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Slang definitions & phrases for -itis

-itis

suffix

used to form nouns An excessive and probably unhealthy involvement with or prevalence of what is indicated: committeeitis/ symbolitis (1903+)


The Dictionary of American Slang, Fourth Edition by Barbara Ann Kipfer, PhD. and Robert L. Chapman, Ph.D.
Copyright (C) 2007 by HarperCollins Publishers.
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