from The American Heritage® Dictionary of the English Language, 5th Edition.

  • noun A small hard mass in the kidney that forms from deposits chiefly of phosphates and urates.

from The Century Dictionary.

  • noun A nodule of brown ironstone, traversed by small veins of calcite.

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

  • noun medicine A calculus in the kidney.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • noun a calculus formed in the kidney


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  • Kidney stones, also called renal calculi, are solid concretions (crystal aggregations) of dissolved minerals in urine; calculi typically form inside the kidneys or bladder. The terms nephrolithiasis and urolithiasis refer to the presence of calculi in the kidneys and urinary tract, respectively.


    Passing a kidney stone is incredibly painful.

    February 4, 2008