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grindstone noun

  /ˈɡɹaɪn(d)ˌstoʊn/ , /ˈɡɹaɪn(d)ˌstəʊn/ , /ˈɡɹɪnˌstoʊn/
  • An abrasive wheel for sharpening, polishing or grinding.
mola
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