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tophus n. 痛風結節 痛風結節 tophus n 1: a deposit of urates around a joint or in the external ear; diagnostic of advanced or chronic gout [synonym: {tophus}, {chalkstone}] 2: an incrustation that forms on the teeth and gums [synonym: {tartar}, {calculus}, {tophus}] Tophus \To"phus\, n.; pl. {Tophi}. [NL.: cf. F. tophus a mineral
concretion in the joint. See {Toph}.] [Written also {tofus}.] 1. (Med.) One of the mineral concretions about the joints, and in other situations, occurring chiefly in gouty persons. They consist usually of urate of sodium; when occurring in the internal organs they are also composed of phosphate of calcium. [1913 Webster] 2. (Min.) Calcareous tufa. [1913 Webster]
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