[hwet-stohn, wet-]
a stone for sharpening cutlery or tools by friction.
anything that sharpens: a whetstone for dull wits.

before 900; Middle English whetston, Old English hwetstān. See whet, stone

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World English Dictionary
whetstone (ˈwɛtˌstəʊn)
1.  a stone used for sharpening edged tools, knives, etc
2.  something that sharpens

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

O.E. hwetstan; see whet + stone.
Online Etymology Dictionary, © 2010 Douglas Harper
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Computing Dictionary

Whetstone definition

The first major synthetic benchmark program, intended to be representative for numerical (floating-point intensive) programming. It is based on statistics gathered by Brian Wichmann at the National Physical Laboratory in England, using an Algol 60 compiler which translated Algol into instructions for the imaginary Whetstone machine. The compilation system was named after the small town of Whetstone outside the City of Leicester, England, where it was designed.
The later dhrystone benchmark was a pun on Whetstone.
Source code: C (ftp://netlib.att.com/netlib/benchmark/whetstonec.Z), single precision Fortran (ftp://netlib.att.com:/netlib/benchmark/whetstones.Z), double precision Fortran (ftp://netlib.att.com:/netlib/benchmark/whetstoned.Z).
["A Synthetic Benchmark", H.J. Curnow and B.A. Wichmann, The Computer Journal, 19,1 (1976), pp. 43-49].
The Free On-line Dictionary of Computing, © Denis Howe 2010 http://foldoc.org
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Example sentences
Every five minutes or so he must stop, pick up a nine-inch long whetstone made
  of grit, and sharpen the blade again.
If you don't have a pedal grindstone, your options are limited to a file and
But suddenly, everyone's honing their rumps on the whetstone.
Have a sharpening steel and whetstone on hand, too, to keep those blades sharp.
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