名詞 calculus:

1. a hard lump produced by the concretion of mineral salts; found in hollow organs or ducts of the body
   同義詞：calculus, concretion
2. an incrustation that forms on the teeth and gums
   同義詞：tartar, calculus, tophus
3. the branch of mathematics that is concerned with limits and with the differentiation and integration of functions
   同義詞：calculus, infinitesimal calculus