[cal.cu.lus] n, pl -li also -lus.es [L, stone (used in reckoning)] (1666) 1 a: a method of computation or calculation in a special notation (as of logic or symbolic logic) b: the mathematical methods comprising differential and integral calculus
2: calculation 3 a: a concretion usu. of mineral salts around organic material found esp. in hollow organs or ducts b: tartar 2
4: a system or arrangement of intricate or interrelated parts