Primary Meanings of calculus
1. 
n 
the branch of mathematics that is concerned with limits and with the differentiation and integration of functions

2. 
n 
a hard lump produced by the concretion of mineral salts; found in hollow organs or ducts of the body

3. 
n 
an incrustation that forms on the teeth and gums

Full Definitions of calculus
1
n the branch of mathematics that is concerned with limits and with the differentiation and integration of functions
 Synonyms:
 infinitesimal calculus
 Types:
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analysis
a branch of mathematics involving calculus and the theory of limits; sequences and series and integration and differentiation

differential calculus, method of fluxions
the part of calculus that deals with the variation of a function with respect to changes in the independent variable (or variables) by means of the concepts of derivative and differential

integral calculus
the part of calculus that deals with integration and its application in the solution of differential equations and in determining areas or volumes etc.

calculus of variations
the calculus of maxima and minima of definite integrals

Fourier analysis, harmonic analysis
analysis of a periodic function into a sum of simple sinusoidal components
 Type of:

pure mathematics
the branches of mathematics that study and develop the principles of mathematics for their own sake rather than for their immediate usefulness
2
n a hard lump produced by the concretion of mineral salts; found in hollow organs or ducts of the body
“renal
calculi can be very painful”
 Synonyms:
 concretion
 Types:
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bladder stone, cystolith
a calculus formed in the bladder

enterolith
a calculus occurring in the intestines

bilestone, gallstone
a calculus formed in the gall bladder or its ducts

kidney stone, nephrolith, renal calculus, urinary calculus
a calculus formed in the kidney

ptyalith
calculus in a salivary gland

salivary calculus, sialolith
a stone formed in the salivary gland

urolith
a urinary stone
3
n an incrustation that forms on the teeth and gums
 Type of:

crust, encrustation, incrustation
a hard outer layer that covers something