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whetstone

[hwet-stohn, wet-] /ˈʰwɛtˌstoʊn, ˈwɛt-/
noun
1.
a stone for sharpening cutlery or tools by friction.
2.
anything that sharpens:
a whetstone for dull wits.
Origin of whetstone
900
before 900; Middle English whetston, Old English hwetstān. See whet, stone
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Based on the Random House Dictionary, © Random House, Inc. 2017.
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British Dictionary definitions for whetstone

whetstone

/ˈwɛtˌstəʊn/
noun
1.
a stone used for sharpening edged tools, knives, etc
2.
something that sharpens
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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Word Origin and History for whetstone
n.

Old English hwetstan; see whet + stone (n.).

Online Etymology Dictionary, © 2010 Douglas Harper
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15
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