Definitions of duster:

• noun:   a pitch thrown deliberately close to the batter
• noun:   a loose coverall (coat or frock) reaching down to the ankles
• noun:   a windstorm that lifts up clouds of dust or sand

  Example: "It was the kind of duster not experienced in years"

• noun:   a piece of cloth used for dusting
• name:  A surname (very rare: popularity rank in the U.S.: #52048)