calculus

As a noun calculus

is (dated|countable) calculation, computation.

As an adjective calculary is

(medicine) of or relating to calculus (stony concretions).

As nouns the difference between calculus and nephrolithotomy

is that calculus is (dated|countable) calculation, computation while nephrolithotomy is (surgery) the removal of a renal calculus by incision into the kidney.

As nouns the difference between calculus and tonsillolith

is that calculus is calculation, computation while tonsillolith is a calculus that forms in the rear of the mouth, in the crevasses of the palatine tonsils.

As nouns the difference between calculus and rheometry

is that calculus is (dated|countable) calculation, computation while rheometry is (physics) the measurement of electrical current.