Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. The calcareous and siliceous rock deposits of springs, lakes, or ground water.
  • n. See tuff.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. the calcareous deposit of lime found near hot springs
  • n. the volcanic rock tuff

from the GNU version of the Collaborative International Dictionary of English

  • 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.

from The Century Dictionary and Cyclopedia

  • n. A rock having a rough or cellular texture, sometimes a fragmental volcanic material, and sometimes a calcareous deposit from springs.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. hard volcanic rock composed of compacted volcanic ash
  • n. a soft porous rock consisting of calcium carbonate deposited from springs rich in lime

Etymologies

Obsolete Italian tufa, tufo, from Latin tōfus.
(American Heritage® Dictionary of the English Language, Fourth Edition)
From Italian tufo, from Latin tōphus or tōfus. (Wiktionary)

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