Find the word definition

The Collaborative International Dictionary
calcareous tufa

Tufa \Tu"fa\, [It. fufo soft, sandy stone, L. tofus, tophus. Cf. Tofus, Toph, and Tophin.] (Min.)

  1. A soft or porous stone formed by depositions from water, usually calcareous; -- called also calcareous tufa.

  2. A friable volcanic rock or conglomerate, formed of consolidated cinders, or scoria.