Definition of "mastoiditis" [mas•toid•i•tis]

• Inflammation of the mastoid process and mastoid cells. (noun)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "He had poor use of his left arm, poor arterial flow through his upper spinal cord, and a chronic infection of the skull known as mastoiditis, according to a bioarchaeological analysis by Katherine Miller of Arizona State University."
• "However, untreated, otitis media can sometimes lead to more serious complications, such as mastoiditis (a rare inflammation of bone adjacent to the ear)."
• "Brodie, Edward for the past 10 days has had otitis with a temperature of 40o, mastoiditis and probably erysipelas as well."