n.
Inflammation of the kidney and its pelvis, caused by bacterial infection.
[New Latin pyelonephrītis : Greek puelos, basin; see pyelitis + NEPHRITIS.]
pyelonephritic py'e·lo·ne·phrit'ic (-frĭt'ĭk) adj.
The American Heritage® Dictionary of the English Language, Fourth Edition Copyright © 2007, 2000 by Houghton Mifflin Company. Updated in 2009. Published by Houghton Mifflin Company. All rights reserved.