A cloth or brush used for removing dust from surfaces. She used a duster to clean the shelves and remove the dust.
A long, lightweight coat worn to protect clothing from dust, often used in the past by people traveling in open vehicles. He wore a duster to keep his clothes clean while driving the old convertible.
A device or machine that sprays or distributes dust, often used in agriculture. The farmer used a duster to apply pesticide to the crops.
A fast pitch in baseball delivered close to the batter with the intention of making them step back from the plate; a brush-back pitch. The pitcher fired a duster under the hitter's chin on the first pitch of the inning.