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rimstone

[rim-stohn] /ˈrɪmˌstoʊn/
noun, Geology
1.
a calcareous deposit forming a dam at the edge or outlet of an overflowing pool of water, as in a cavern.
Origin
1925-1930
1925-30; rim + stone
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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5
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