tophus
     n 1: a deposit of urates around a joint or in the external ear;
          diagnostic of advanced or chronic gout [syn: {chalkstone}]
     2: an incrustation that forms on the teeth and gums [syn: {tartar},
         {calculus}]
     [also: {tophi} (pl)]
Source: WordNet® 2.0

tophi
     See {tophus}
Source: WordNet® 2.0