#sharpener  any implement that is used to make an edge sharper; "a knife sharpener"
  supertype:  #implement  instrumentation (a piece of equipment or tool) used to effect an end
  subtype:  #grindstone  a revolving stone shaped like a disk; used to grind or sharpen or polish edge tools
  subtype:  #steel.sharpener  knife sharpener consisting of a ridged steel rod
  subtype:  #strop  a leather strap used to sharpen razors

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