Tufa

[tju:fә]

解释:

(noun.) a soft porous rock consisting of calcium carbonate deposited from springs rich in lime.

比利校对--From WordNet

解释:

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

(-) A friable volcanic rock or conglomerate, formed of consolidated cinders, or scoria.

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同义词及近义词：

n. Tuff, volcanic tufa.

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解释:

n. a variety of calcium carbonate usually deposited from springs—calcareous tufa; the word was formerly used as synonymous with tuff.—adj. Tufā′ceous.

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