1. (

• calculus ,
• concretion

) 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" ;

2. (

• tartar ,
• calculus ,
• tophus

) an incrustation that forms on the teeth and gums ;

3. (

• calculus ,
• infinitesimal_calculus

) the branch of mathematics that is concerned with limits and with the differentiation and integration of functions ;