Lithiasis

[li'θaiәsis]

(noun.) the formation of stones (calculi) in an internal organ.

Typist: Phil--From WordNet

(n.) The formation of stony concretions or calculi in any part of the body, especially in the bladder and urinary passages.

Checker: Prudence

n. a bodily condition in which uric acid is deposited as stone or gravel in the urinary canals.

Editor: Stephen