noun Pathology.
inflammation of the mastoid process.

1885–90; mastoid + -itis Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
mastoiditis (ˌmæstɔɪˈdaɪtɪs)
inflammation of the mastoid process

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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American Heritage
Medical Dictionary

mastoiditis mas·toid·i·tis (mās'toi-dī'tĭs)
Inflammation of the mastoid process and mastoid sinuses.

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
mastoiditis   (mās'toid-ī'tĭs)  Pronunciation Key 
Inflammation of the mastoid process, usually resulting from an acute infection of the middle ear.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
Mastoiditis made his bandaged ears ache, but still he tuned in to the hubbub of the streets.
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