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Definition of Urinary calculus

Urinary calculus: A stone in the urinary tract. The word "calculus" in Latin means "a pebble." Pebbles were once used for counting, from which came the mathematical field of calculus. A urinary calculus is a pebble in the urinary system.

Source: MedTerms™ Medical Dictionary
http://www.medicinenet.com/script/main/art.asp?articlekey=11859
Last Editorial Review: 8/28/2013

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