noun Pathology.

inflammation of the mastoid process.

Origin of mastoiditis

First recorded in 1885–90; mastoid + -itis Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for mastoiditis

Historical Examples of mastoiditis

  • These sometimes become infected from the ear, causing the condition known as mastoiditis.


    Ernest G. Martin

British Dictionary definitions for mastoiditis



inflammation of the mastoid process
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

mastoiditis in Medicine




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.

mastoiditis in Science



Inflammation of the mastoid process, usually resulting from an acute infection of the middle ear.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.