dust·er (dŭs′tər)
n.
1. One that dusts, especially:
a. A cloth or brush used to remove dust.
b. A device for sifting or scattering a powdered substance.
2. A smock worn to protect one's clothing from dust.
3.
a. A woman's loose dress-length housecoat.
b. A woman's light, loose, usually three-quarter-length top, often worn over a blouse or as part of a set with pants.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
duster (ˈdʌstə)
n
1. (Textiles) a cloth used for dusting furniture, etc. US name: dust cloth
2. (Agriculture) a machine for blowing out dust over trees or crops
3. a person or thing that dusts
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
dust•er (ˈdʌs tər)

n.
1. a person or thing that removes or applies dust.
2. a cloth, brush, etc., for removing dust.
3. a lightweight knee-length housecoat.
4. an apparatus or device for sprinkling dust, powder, insecticide, or the like.
5. crop duster
6.
a. a long lightweight overcoat, worn esp. in the early days of automobiles to protect clothing from dust.
b. a loose-fitting lightweight coat for women.