'Tufa' definitions:
Definition of 'tufa'
(from WordNet)
noun
A soft porous rock consisting of calcium carbonate deposited from springs rich in lime [syn: tufa, calc- tufa]
noun
Hard volcanic rock composed of compacted volcanic ash [syn: tuff, tufa]
Definition of 'Tufa'
From: GCIDE
- Tufa \Tu"fa\, [It. fufo soft, sandy stone, L. tofus, tophus. Cf. Tofus, Toph, and Tophin.] (Min.) (a) A soft or porous stone formed by depositions from water, usually calcareous; -- called also calcareous tufa. (b) A friable volcanic rock or conglomerate, formed of consolidated cinders, or scoria. [1913 Webster]