#calculus__stone__concretion  a hard lump produced by the concretion of mineral salts; found in hollow organs or ducts of the body
  supertype:  #rock.natural_object__stone  a lump of hard consolidated mineral matter; "he threw a rock at me"
  subtype:  #bladder_stone__bladderstone__cystolith  a calculus formed in the bladder
  subtype:  #enterolith  a calculus occurring in the intestines
  subtype:  #gallstone__bilestone  a calculus formed in the gall bladder or its ducts
  subtype:  #kidney_stone__urinary_calculus__nephrolith__renal_calculus  a calculus formed in the kidney
  subtype:  #ptyalith  calculus in a salivary gland
  subtype:  #sialolith__salivary_calculus  a stone formed in the salivary gland
  subtype:  #urolith  a urinary stone

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