WordReference Random House Learner's Dictionary of American English © 2017cal•cu•lus^{} */ˈkælkyələs/USA pronunciation*
n. [uncountable]
- Mathematicsa branch of mathematics that calculates amounts that change constantly:Calculus can help you figure out how fast an object falls.
- Dentistrya hard, yellowish substance on teeth formed from dental plaque;

tartar.

WordReference Random House Unabridged Dictionary of American English © 2017cal•cu•lus^{}
*(kal***′**kyə ləs),USA pronunciation n., pl. **-li** *(-lī′),USA pronunciation* **-lus•es.**
- Mathematicsa method of calculation, esp. one of several highly systematic methods of treating problems by a special system of algebraic notations, as differential or integral calculus.
- Pathologya stone, or concretion, formed in the gallbladder, kidneys, or other parts of the body.
- DentistryAlso called
**tartar.** a hard, yellowish to brownish-black deposit on teeth formed largely through the mineralization of dead bacteria in dental plaques by the calcium salts in salivary secretions and subgingival transudates.
- calculation:the calculus of political appeal.

- Latin: pebble, small stone (used in reckoning), equivalent. to
*calc-* (stem of *calx* stone) + *-ulus* -ule - 1610–20

calculus,^{} +

n.
calculation:the calculus of political appeal.
Collins Concise English Dictionary © HarperCollins Publishers::

**calculus** /ˈkælkjʊləs/ n ( pl -luses)- 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 - any mathematical system of calculation involving the use of symbols
- ( 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
'**calculus**' also found in these entries: