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The Collaborative International Dictionary
Renal calculus

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).

WordNet
renal calculus

n. a calculus formed in the kidney [syn: kidney stone, urinary calculus, nephrolith]