Webster’s Revised Unabridged Dictionary · 1913
Chalkstone
Chalk′stone′ (·stōn′), 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.