For the noun: calculus
Plural form: calculuses, calculi

WordReference Random House Learner's Dictionary of American English © 2015
cal•cu•lus /ˈkælkyələs/USA pronunciation n. [uncountable]
  1. Mathematicsa branch of mathematics that calculates amounts that change constantly:Calculus can help you figure out how fast an object falls.
  2. Dentistrya hard, yellowish substance on teeth formed from dental plaque;

Collins Concise English Dictionary © HarperCollins Publishers::

calculus /ˈkælkjʊləs/ n ( pl -luses)
  1. a branch of mathematics, developed independently by Newton and Leibniz. Both differential calculus and integral calculus are concerned with the effect on a function of an infinitesimal change in the independent variable as it tends to zero
  2. any mathematical system of calculation involving the use of symbols
  3. ( pl -li / -ˌlaɪ/) a stonelike concretion of minerals and salts found in ducts or hollow organs of the body
Etymology: 17th Century: from Latin: pebble, stone used in reckoning, from calx small stone, counter

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