A stone within the body, such as a stone in the urinary
tract.
2 .
The calcium salt deposits on the teeth.
3.
A field of mathematics.
These different meanings of "calculus" all go bach to the origin of the word. In
Latin, a calculus is "a pebble." Pebbles were once used for counting, from which
came the mathematical field of calculus. A urinary calculus is a literally pebble
in the urinary system. And the calculus on the teeth is, like a urinary stone, an
abnormal concretion of mineral salts within the body.
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