**Synonyms:** infinitesimal calculus, calculus

**Definition:** the branch of mathematics that is concerned with limits and with the differentiation and integration of functions

**Similar words:** pure mathematics

**Definition:** the branches of mathematics that study and develop the principles of mathematics for their own sake rather than for their immediate usefulness

**Synonyms:** calculus, concretion

**Definition:** a hard lump produced by the concretion of mineral salts; found in hollow organs or ducts of the body

**Usage:** *renal calculi can be very painful*

**Definition:** a lump or mass of hard consolidated mineral matter

**Usage:** *he threw a rock at me*

**Synonyms:** tartar, tophus, calculus

**Definition:** an incrustation that forms on the teeth and gums

**Similar words:** crust, encrustation, incrustation

**Definition:** a hard outer layer that covers something