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flowstone

[floh-stohn]
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noun Petrology.
  1. a layered deposit of calcium carbonate, CaCO3, left by thin sheets of flowing water, as in a cave.
Compare dripstone.

Origin of flowstone

1920–25, Amer.; flow + stone
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018