DuckCorp Dico

Found one definition

1.                 From WordNet (r) 3.0 (2006):
                   
   
   
                   
                     
   calculus
       n 1: a hard lump produced by the concretion of mineral salts;
            found in hollow organs or ducts of the body; "renal calculi
            can be very painful" [syn: calculus, concretion]
       2: an incrustation that forms on the teeth and gums [syn:
          tartar, calculus, tophus]
       3: the branch of mathematics that is concerned with limits and
          with the differentiation and integration of functions [syn:
          calculus, infinitesimal calculus]