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rottenstone

[rot-n-stohn] /ˈrɒt nˌstoʊn/
noun
1.
a friable stone resulting from the decomposition of a siliceous limestone, used as a powder for polishing metals.
Origin
1670-1680
1670-80; rotten + stone
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for rottenstone

rottenstone

/ˈrɒtənˌstəʊn/
noun
1.
a much-weathered limestone, rich in silica: used in powdered form for polishing metal
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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