flowstone

[ floh-stohn ]
/ ˈfloʊˌstoʊn /

noun Petrology.

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. 2019