calculus

nouns

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"
calculus, concretion
is derived from
calculous
an incrustation that forms on the teeth and gums
calculus, tartar, tophus
the branch of mathematics that is concerned with limits and with the differentiation and integration of functions
calculus, infinitesimal calculus
is derived from
calculate