(1):

(n.) One who, or that which, dusts; a utensil that frees from dust.

(2):

(n.) A revolving wire-cloth cylinder which removes the dust from rags, etc.

(3):

(n.) A blowing machine for separating the flour from the bran.

(4):

(n.) A light over-garment, worn in traveling to protect the clothing from dust.