whetstone

Noun
  1. A flat stone for sharpening edged tools or knives (synset 104584712)
    is a type of: stone - building material consisting of a piece of rock hewn in a definite shape for a special purpose
    subtypes:
    • hone - a whetstone made of fine gritstone; used for sharpening razors
    • oilstone - a whetstone for use with oil

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