mas·ti·tis | \ma-ˈstī-təs \
plural mastitides\-ˈsti-tə-ˌdēz \

Definition of mastitis 

: inflammation of the breast or udder usually caused by infection

Keep scrolling for more

Other Words from mastitis

mastitic \-ˈsti-tik \ adjective

Examples of mastitis in a Sentence

Recent Examples on the Web

Found in Europe and the U.S., the bacteria can cause cows to develop mastitis, pneumonia, arthritis and other diseases. Nick Perry, The Seattle Times, "New Zealand to kill 150,000 cows to end bacterial disease," 28 May 2018 When primates are pregnant, zookeepers train them to be comfortable with breast contact and diligently check for mastitis, an infection of the breast tissue that commonly affects breastfeeding females. Zoe Sayler, Smithsonian, "What Aardvark Milk Reveals about the Evolution of Lactation," 21 Mar. 2018 Shepard came to Bell's rescue when the actress was dealing with mastitis, or a build-up of milk in her breast duct, after one of her daughters had stopped nursing. Grace Gavilanes,, "TMI Alert! 10 Times Celebs Overshared Like It Was NBD," 6 Feb. 2018 Women can be seriously laid up by a case of mastitis. Korin Miller, SELF, "What Actually Is Mastitis?," 3 Nov. 2017 The actress also suffered from mastitis, a painful infection of the breast tissue which often occurs within the first six to 12 weeks after giving birth. Lindsay Kimble,, "From Her Surprise Pregnancy to 24-Hour Labor: 5 Biggest Revelations From Amanda Seyfried's Post-Baby Interview," 13 July 2017 Max Paape, 80, a U.S. Agriculture Department dairy research scientist credited with developing medical methods of fighting bovine mastitis, an inflammatory disease that affects cow udders, died May 26 at a hospital in Bethesda, Md. Eric Bibby, Washington Post, "Notable deaths in the Washington area," 26 June 2017

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'mastitis.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

See More

First Known Use of mastitis

circa 1842, in the meaning defined above

History and Etymology for mastitis

New Latin, from Greek mastos breast

Keep scrolling for more

Learn More about mastitis

Dictionary Entries near mastitis








Statistics for mastitis

Look-up Popularity

Time Traveler for mastitis

The first known use of mastitis was circa 1842

See more words from the same year

Keep scrolling for more

More Definitions for mastitis


mas·ti·tis | \ma-ˈstīt-əs \
plural mastitides\-ˈtit-ə-ˌdēz \

Medical Definition of mastitis 

: inflammation of the mammary gland or udder usually caused by infection

called also mammitis

— see blue bag, bovine mastitis, garget, summer mastitis

More from Merriam-Webster on mastitis

See words that rhyme with mastitis Encyclopedia article about mastitis

Comments on mastitis

What made you want to look up mastitis? Please tell us where you read or heard it (including the quote, if possible).


evasion of direct action or statement

Get Word of the Day daily email!

Test Your Vocabulary

Great Scrabble Words—A Quiz

  • scrabble-tiles-that-read-scrabble-quiz
  • Which of the following Q-without-U words means the number five in cards or dice?
True or False

Test your knowledge - and maybe learn something along the way.


Test Your Knowledge - and learn some interesting things along the way.


Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!