calculus
/kalkjool ss/ • noun (pl. calculi /kalkyooli/ or calculuses) 1 the branch of mathematics concerned with finding derivatives and integrals of functions by methods based on the summation of infinitesimal differences. 2 Medicine a stone formed by deposition of minerals in the kidney, gall bladder, or other organ. — ORIGIN Latin, ‘small pebble’ (as used on an abacus).
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