Duster \Dust"er\, n.

1. One who, or that which, dusts; a utensil that frees from dust. Specifically:
   (a) (Paper Making) A revolving wire-cloth cylinder which removes the dust from rags, etc.
   (b) (Milling) A blowing machine for separating the flour from the bran.

2. A light over-garment, worn in traveling to protect the clothing from dust. [U.S.]

Source: Webster's Revised Unabridged Dictionary (1913)