Definitions of dust:

• noun:   fine powdery material such as dry earth or pollen that can be blown about in the air

  Example: "The furniture was covered with dust"

• noun:   free microscopic particles of solid material

  Example: "Astronomers say that the empty space between planets actually contains measurable amounts of dust"

• noun:   the remains of something that has been destroyed or broken up
• verb:   remove the dust from

  Example: "Dust the cabinets"

• verb:   rub the dust over a surface so as to blur the outlines of a shape

  Example: "The artist dusted the charcoal drawing down to a faint image"

• verb:   cover with a light dusting of a substance

  Example: "Dust the bread with flour"

• verb:   distribute loosely
• name:  A surname (very rare: popularity rank in the U.S.: #40863)