From Longman Dictionary of Contemporary Englishsandersand‧er /ˈsændə $ -ər/ (also sanding machine) noun [countable] 
TZan electric tool with a rough surface that moves very quickly, used for making surfaces smooth, especially the surface of wood
TZan electric tool with a rough surface that moves very quickly, used for making surfaces smooth, especially the surface of woodExamples from the Corpus
sander• A sander will be required to remove excess filler and shape it to match the existing timber.• They rented 200-pound belt sanders and sanded floors, carefully taking boards out of closets to patch the really bad places.• I tried to arrange guides on the drum sander but quickly gave up.• This is still a relatively light machine, but the weight is equivalent to a conventional half-sheet orbital sander.• Decker power sander or Sears Craftsman heavy-duty pressure-washer, unless you want to see it end up as a doorstop.• He does not use lathes, power saws, power sanders or spray guns.• The sander was exceptionally quiet to use. 