[pahy-uh-loh-nuh-frahy-tis, pahy-el-oh-]
noun Pathology.
inflammation of the kidney and its pelvis, caused by a bacterial infection.

1865–70; pyelo- + nephritis

pyelonephritic [pahy-uh-loh-nuh-frit-ik, pahy-el-oh-] , adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
pyelonephritis (ˌpaɪələʊnɪˈfraɪtɪs)
Compare pyelitis inflammation of the kidney and renal pelvis

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

pyelonephritis py·e·lo·ne·phri·tis (pī'ə-lō-nə-frī'tĭs)
Inflammation of the kidney and its pelvis, caused by bacterial infection. Also called nephropyelitis.

py'e·lo·ne·phrit'ic (-frĭt'ĭk) adj.
The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
If the infection spreads to the kidneys, it is called pyelonephritis and may be more serious.
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