Thomas Davidson,
Chambers's Twentieth Century Dictionary 1908…
(1908)
“ Calculus, kal′kū-lus, n. a stone-like concretion which forms in certain parts of the body: one of the higher branches of mathematics:—pl. Calculi (kal′kū-li) .—adj. Cal′culose, stony or like stone: gritty: affected with stone or with gravel.—Calculus of finite differences not merely does not consider differentials, but does not assume continuity.—Differential calculus, a method of treating the values of ratios of differentials or the increments of quantities continually varying; Integral calculus, the summation of an infinite series of differentials. ”
