Synonyms:
calculus, concretion
Meaning: 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"
Usage examples
And cutting out a blouse by differential calculus is weary, uphill work for a high-school teacher.
I cut out half her clothes for her; her own ideas were almost entirely limited to differential calculus.
If they'd told me at college that other people understood the integral calculus, and I didn't, then pride would have come in.
Some years later, when his method of fluxions was published, another and a worse controversy arose--this time with Leibnitz, who had also independently invented the differential calculus.