What is "dust-back"

duster \dust"er\ (d[u^]st"[~e]r), n.

1. One who, or that which, dusts; a utensil that frees from dust. Specifically:

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

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

   3. A dustcloth or a brush used for removing dust from objects or surfaces.

2. A long light overgarment; specifically

   1. a light over-garment, formerly worn when traveling in open vehicles to protect the clothing from dust.

   2. A light housecoat worn by women.

   3. A light overcoat worn by women, often having no lining.

3. A device for spreading a powder, especially one for spreading insecticide on plants.

4. (Baseball) 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.

5. A dust storm.