hydronephrosis

from WordNet (r) 3.0 (2006)

hydronephrosis
    n 1: accumulation of urine in the kidney because of an
         obstruction in the ureter

from The Collaborative International Dictionary of English v.0.48

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.
   [1913 Webster]