1) Tophus 2) Urate 1) Tophus 
• (n.) A mass of chalk. • (n.) 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.
Chalk'stone` noun 1. A mass of chalk. « As chalkstones . . . beaten in sunder. Isa. xxvii. 9. » 2. (Medicine) A chalklike concretion, consisting mainly of urate of sodium, found in and about the small joints, in the external ear, and in other situatio...
a chalklike concretion in the tissues or small joints of a person with gout.