renal calculus

from WordNet (r) 3.0 (2006)

renal calculus
    n 1: a calculus formed in the kidney [syn: {kidney stone},
         {urinary calculus}, {nephrolith}, {renal calculus}]

from The Collaborative International Dictionary of English v.0.48

Renal calculus \Renal calculus\ (Med.),
   an abnormal concretion formed in the excretory passages of
   the kidney, composed primarily of calcium oxalates and
   phosphates; -- also called {kidney stone}, {nephrolith}, and
   {nephritic calculus} (an obsolete term).
   [PJC]