Definitions

from The Century Dictionary.

  • noun The presence of pus in the kidney and its pelvis.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun An infection of the renal collecting system, in which pus collects in the renal pelvis and causes distension of the kidney.

Etymologies

from Wiktionary, Creative Commons Attribution/Share-Alike License

pyo- +‎ nephrosis

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