rottenstone
American Heritage Dictionary:
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rot·ten·stone
(rŏt'n-stōn') 
n.
A soft decomposed limestone, used in powder form as a polishing material.
n.
A soft decomposed limestone, used in powder form as a polishing material.
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A soft, friable limestone; in pulverized form, used for polishing soft metal surfaces and wood.
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American Heritage Dictionary
The American Heritage® Dictionary of the English Language, Fourth Edition Copyright © 2007, 2000 by Houghton Mifflin Company. Updated in 2009. Published by Houghton Mifflin Company. All rights reserved.
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McGraw-Hill Dictionary of Architecture & Construction
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc. All rights reserved.
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