any of various sedimentary rocks, as travertine, made up of deposits of calcium carbonate formed by evaporation or precipitation in or near a cave, spring, lake, etc.
Origin of tufaItalian tufo, tufa, kind of porous stone from Classical Latin tofus, tuff, tufa
A soft, friable, and porous sedimentary rock consisting of calcium carbonate and formed by the evaporation of water, especially at the mouth of a hot spring or on a drying lakebed. It can also be precipitated by algae or bacteria.
Origin of tufaObsolete Italian tufa, tufo from Latin tōfus
(countable and uncountable, plural tufas)