rubstone

[ruhb-stohn]

Origin of rubstone

late Middle English word dating back to 1400–50; see origin at rub, stone
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British Dictionary definitions for rubstone

rubstone

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