rubstone

[ ruhb-stohn ]
/ ˈrʌbˌstoʊn /

noun

a stone, especially a whetstone, used for polishing or sharpening.

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Origin of rubstone

late Middle English word dating back to 1400–50; see origin at rub, stone
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020

British Dictionary definitions for rubstone

rubstone
/ (ˈrʌbˌstəʊn) /

noun

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