Synonyms/Hypernyms (Ordered by Estimated Frequency) of noun tufa

2 senses of tufa

Sense 1
tufa, calc-tufa -- (a soft porous rock consisting of calcium carbonate deposited from springs rich in lime)
       => rock, stone -- (material consisting of the aggregate of minerals like those making up the Earth's crust; "that mountain is solid rock"; "stone is abundant in New England and there are many quarries")

Sense 2
tuff, tufa -- (hard volcanic rock composed of compacted volcanic ash)
       => volcanic rock -- (extrusive igneous rock solidified near or on the surface of the Earth)