#abrasive_material__abrasive__abradant  a substance that abrades or wears down
  supertype:  #material.substance__stuff  the tangible substance that goes into the makeup of a physical object; "coal is a hard black material"; "wheat is the stuff they use to make bread"
  subtype:  #carborundum  (trade mark) an abrasive composed of silicon carbide crystals
  subtype:  #steel_wool__steelwool__wire_wool  a mass of woven steel fibers used as an abrasive
  subtype:  #emery_cloth__emerycloth  cloth covered with powdered emery
  subtype:  #emery_paper__emerypaper__sandpaper  stiff paper coated with powdered emery or sand

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