Definition of 'calculus'

Noun

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"
      Synonyms: concretion
2. an incrustation that forms on the teeth and gums
      Synonyms: tartar tophus
3. the branch of mathematics that is concerned with limits and with the differentiation and integration of functions
      Synonyms: infinitesimal calculus

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