tophus noun. ['tǝʊfǝs] Pl. tophi ['tǝʊfʌɪ]. M16.
[Latin tophus, tofus loose porous stones of various kinds, whence Italian tufo, French tuf: see also TUFA, TUFF noun.]
1. A porous stone deposit; tufa, travertine. M16.

2. Medicine. A deposit of sodium urate which forms around a joint, in the pinna of the ear, etc., in cases of gout. Also, gravel, or a stone or calculus, formed within the body. E17.

■ tophous adjective of the nature of a stony or calcareous concretion M17-M18.

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