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Definition of Calculus

Calculus: A stone, as in the urinary tract, or calcium salt deposits on the teeth. In Latin, the word calculus means 'a pebble.' Pebbles were once used for counting, from which came the mathematical field of calculus.

Source: MedTerms™ Medical Dictionary
http://www.medicinenet.com/script/main/art.asp?articlekey=18384
Last Editorial Review: 3/19/2012

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