D defs.my
Entry 2 senses Webster, 1913

Tophus

· To·phus · IPA
01 n. One of the mineral concretions about the joints, and in other situations, occurring chiefly in gouty persons. They consist usually of urate…
pl. Tophi ((#))
  1. 1.
    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.(Med.)
  2. 2.
    Calcareous tufa.(Min.)