a. [f. TOPH-US + -IC.] Of the nature of toph or tophus; tophaceous.
1789. J. Williams, Min. Kingd., II. 383. There are great quantities of the concreted substance called tufa in many parts of Scotland…. The process of nature, in the formation of this tophic substance, is to be explained upon the same principles as the stallactites.
