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whetstone noun

  /wɛtstəʊn/ , /ˈwɛtˌstoʊn/ , /ˈʍɛtˌstoʊn/ , [ˈwɛʔˌstoʊn] , [ˈʍɛʔˌstoʊn]
  • A sharpening stone; a hard stone or piece of synthetically bonded hard minerals that has been formed with at least one flat surface, used to sharpen or hone an edged tool.
 pedra d'esmolar, pedra esmoladora
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