\Chalk"stone`\, n.
1. A mass of chalk.
         As chalkstones . . . beaten in sunder. --Isa. xxvii.
                                               9.
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.