In math, calculus is a branch that studies how things change, using concepts like derivatives and integrals. In medicine, 'calculus' can also mean a hard stone-like deposit that forms in the body, like kidney stones.
From Latin 'calculus' meaning 'small stone,' used for counting or gaming. In the 17th century, mathematicians like Newton and Leibniz used 'calculus' to name their new method for systematically computing changes and areas. The medical sense also comes from the 'stone' meaning.
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