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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. 9. [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]