duster /(dŭst"ẽr)/

dust·er

duster

n.
  1. One who, or that which, dusts; a utensil that frees from dust. (Paper Making)
  2. A long light overgarment; [U.S.]
  3. A device for spreading a powder, especially one for spreading insecticide on plants.
  4. A pitch intentionally thrown by a pitcher directly at or very close to the batter, intended to make the batter stand further away from home plate; also called a dust-back pitch or a dust-back. (Baseball)
  5. A dust storm.