py·​elo·​ne·​phri·​tis | \ ˌpī-(ə-)lō-ni-ˈfrī-təs How to pronounce pyelonephritis (audio) \

Definition of pyelonephritis

: inflammation of both the lining of the renal pelvis and the parenchyma of the kidney especially due to bacterial infection

Keep scrolling for more

Other Words from pyelonephritis

pyelonephritic \ ˌpī-​(ə-​)lō-​ni-​ˈfri-​tik How to pronounce pyelonephritic (audio) \ adjective

Examples of pyelonephritis in a Sentence

Recent Examples on the Web Kidney infection Kidney infection (or pyelonephritis) is a type of UTI that generally begins in your urethra or bladder and travels to one or both of your kidneys. Samantha Lauriello,, "What Does It Mean if You’re Peeing Blood? We Asked a Doctor," 9 Sep. 2019 The least common type of UTI, a kidney infection (acute pyelonephritis), can cause flank pain, fever, chills, nausea, and vomiting. Carolyn L. Todd, SELF, "Here’s Why You Should Always Wipe Front-to-Back," 9 Mar. 2019

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

First Known Use of pyelonephritis

1839, in the meaning defined above

History and Etymology for pyelonephritis

New Latin

Keep scrolling for more

Learn More about pyelonephritis

Time Traveler for pyelonephritis

Time Traveler

The first known use of pyelonephritis was in 1839

See more words from the same year

Statistics for pyelonephritis

Cite this Entry

“Pyelonephritis.” Dictionary, Merriam-Webster, Accessed 28 Nov. 2020.

Keep scrolling for more

More Definitions for pyelonephritis


py·​elo·​ne·​phri·​tis | \ ˌpī-(ə-)lō-ni-ˈfrīt-əs How to pronounce pyelonephritis (audio) \
plural pyelonephritides\ -​ˈfrit-​ə-​ˌdēz How to pronounce pyelonephritides (audio) \

Medical Definition of pyelonephritis

: inflammation of both the parenchyma of a kidney and the lining of its renal pelvis especially due to bacterial infection

Other Words from pyelonephritis

pyelonephritic \ -​ˈfrit-​ik How to pronounce pyelonephritic (audio) \ adjective

More from Merriam-Webster on pyelonephritis Encyclopedia article about pyelonephritis

Comments on pyelonephritis

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


Test Your Vocabulary

A Thanksgiving Word Quiz

  • a traditional thanksgiving dinner
  • November comes from a word for which of the following numbers?
Spell It

Can you spell these 10 commonly misspelled words?

Add Diction

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!