Meaning of CALCULUS in English

noun a method of computation; any process of reasoning by the use of symbols; any branch of mathematics that may involve calculation.

2. calculus ·noun any solid concretion, formed in any part of the body, but most frequent in the organs that act as reservoirs, and in the passages connected with them; as, biliary calculi; urinary calculi, ·etc.

Webster English vocab.      Английский словарь Webster.