- 1. A soft or porous stone formed by depositions from water, usually calcareous; -- called also calcareous tufa. Source: opted
- 2. A friable volcanic rock or conglomerate, formed of consolidated cinders, or scoria. Source: opted
- 3. n. a soft porous rock consisting of calcium carbonate deposited from springs rich in lime Source: wordnet
- 4. n. hard volcanic rock composed of compacted volcanic ash Source: wordnet
- 5. (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. Source: webster
- 6. n:100 n. a soft porous rock consisting of calcium carbonate deposited from springs rich in lime Source: ecdict
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