From The Collaborative International Dictionary of English v.0.48:

Chalkstone \Chalk"stone`\, n.
   1. A mass of chalk.
      [1913 Webster]

            As chalkstones . . . beaten in sunder. --Isa. xxvii.
      [1913 Webster]

   2. (Med.) A chalklike concretion, consisting mainly of urate
      of sodium, found in and about the small joints, in the
      external ear, and in other situations, in those affected
      with gout; a tophus.
      [1913 Webster]
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