Meaning of CALCULUS in English

/ ˈkælkjələs; NAmE / noun

[ U ] the type of mathematics that deals with rates of change, for example in the slope of a curve or the speed of a falling object



mid 17th cent.: from Latin , literally small pebble (as used on an abacus) .

Oxford Advanced Learner's English Dictionary.      Оксфордский английский словарь для изучающик язык на продвинутом уровне.