noun (n)

• a hard lump produced by the concretion of mineral salts; found in hollow organs or ducts of the body(noun.object)

  Synonym:
  concretion
  

  source: wordnet30
• an incrustation that forms on the teeth and gums(noun.object)

  Synonym:
  tartar, tophus
  

  source: wordnet30
• the branch of mathematics that is concerned with limits and with the differentiation and integration of functions(noun.cognition)

  Synonym:
  infinitesimal calculus
  

  source: wordnet30
• Any solid concretion, formed in any part of the body, but most frequent in the organs that act as reservoirs, and in the passages connected with them; as, biliary calculi; urinary calculi, etc.(noun)

  source: webster1913