calculus

Noun
  1. A hard lump produced by the concretion of mineral salts;
    Found in hollow organs or ducts of the body (synset 109253675)
    "renal calculi can be very painful"
  2. An incrustation that forms on the teeth and gums (synset 109478055)
  3. The branch of mathematics that is concerned with limits and with the differentiation and integration of functions (synset 106023090)

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