chalk·stone /ˈʧɔkˌston/ 名詞
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.
n : a deposit of urates around a joint or in the external ear;
diagnostic of advanced or chronic gout [syn: tophus]