Accumulation of urine in the kidney because of an obstruction in the ureter

Wiktionary Word definitions in Wiktionary
n. (context pathology English) distension of the kidneys due to obstruction in the flow of urine

The Collaborative International Dictionary Word definitions in The Collaborative International Dictionary
Hydronephrosis \Hy`dro*ne*phro"sis\, n. [NL., Gr. "y`dwr water + ? a kidney.] (Med.) An accumulation of urine in the pelvis of the kidney, occasioned by obstruction in the urinary passages.

WordNet Word definitions in WordNet
n. accumulation of urine in the kidney because of an obstruction in the ureter

Wikipedia Word definitions in Wikipedia
Hydronephrosis — literally "water inside the kidney" — refers to distension and dilation of the renal pelvis and calyces , usually caused by obstruction of the free flow of urine from the kidney . Untreated, it leads to progressive atrophy of the kidney. ...