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rubstone

[ruhb-stohn] /ˈrʌbˌstoʊn/
noun
1.
a stone, especially a whetstone, used for polishing or sharpening.
Origin
late Middle English
1400-1450
1400-50; late Middle English; see rub, stone
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for rub-stone

rubstone

/ˈrʌbˌstəʊn/
noun
1.
a stone used for sharpening or smoothing, esp a whetstone
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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