What is the meaning of duster?

noun

• A windstorm that lifts up clouds of dust or sand.
  • usage: "it was the kind of duster not experienced in years"
  • synonyms: dust storm, sandstorm, sirocco
• A loose coverall (coat or frock) reaching down to the ankles.
  • synonyms: gaberdine, gabardine, smock, dust coat
• A piece of cloth used for dusting.
  • synonyms: dustcloth, dustrag
• A pitch thrown deliberately close to the batter. .