whetstone

Definitions of whetstone
  1. noun
    a flat stone for sharpening edged tools or knives
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    types:
    hone
    a whetstone made of fine gritstone; used for sharpening razors
    oilstone
    a whetstone for use with oil
    type of:
    stone
    building material consisting of a piece of rock hewn in a definite shape for a special purpose
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