Webster's English Dictionary

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calculus

cal.cu.lus \-l*s\ \-.li-, -.le-\ n or cal.cu.li also cal.cu.lus.es [L, 
   pebble, stone in the bladder or kidney, stone used in reckoning] pl  1: a 
   concretion usu. of mineral salts around organic material found esp. in  
   hollow organs or ducts archaic  2: CALCULATION  3a: a method of computation 
   or calculation in a special symbolic notation  3b: the mathematical methods 
   comprising differential and integral calculus