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

  • n. Calcareous tufa, a porous or spongy deposit of calcium carbonate found in calcareous mineral springs.

from the GNU version of the Collaborative International Dictionary of English

  • n. See under calcite.

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

  • n. a soft porous rock consisting of calcium carbonate deposited from springs rich in lime


calc(areous) + tufa.
(American Heritage® Dictionary of the English Language, Fourth Edition)



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