Gain access to thousands of additional definitions and advanced search features—ad free! JOIN NOW
1881, in the meaning defined above
Keep scrolling for more
Resources for mastoiditis
Time Traveler for mastoiditis
See more words from the same year
More Definitions for mastoiditis
More from Merriam-Webster on mastoiditis
Britannica.com: Encyclopedia article about mastoiditis
Comments on mastoiditis
What made you want to look up mastoiditis? Please tell us where you read or heard it (including the quote, if possible).
to deny responsibility for
Get Word of the Day daily email!
What did you just call me?! A Quiz
Can you spell these 10 commonly misspelled words?
Test Your Knowledge - and learn some interesting things along the way.
Former RNC chair derides Trump
emergency, national emergency
Trump declares crisis over wall
Bezos writes post about Pecker
Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!
It relates to godfathers.
Nothing to see here.
Words from the week of 2/15/2019
Is 'orientate' a real word?
Comedian ISMO on what separates a boot from a trunk
Comedian ISMO on the complexities of the word 'tip'
How to use a word that (literally) drives some people nuts.
The awkward case of 'his or her'
Never be caught off guard
A quiz for lovers and haters
Do you know the person or title these quotes describe?