Search Result for "tufa": 
Wordnet 3.0

NOUN (2)

1. a soft porous rock consisting of calcium carbonate deposited from springs rich in lime;
[syn: tufa, calc-tufa]

2. hard volcanic rock composed of compacted volcanic ash;
[syn: tuff, tufa]


The Collaborative International Dictionary of English v.0.48:

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]
WordNet (r) 3.0 (2006):

tufa n 1: a soft porous rock consisting of calcium carbonate deposited from springs rich in lime [syn: tufa, calc- tufa] 2: hard volcanic rock composed of compacted volcanic ash [syn: tuff, tufa]