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.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.