Quick definitions from WordNet (dust)

▸ noun:  fine powdery material such as dry earth or pollen that can be blown about in the air ("The furniture was covered with dust")
▸ noun:  free microscopic particles of solid material ("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 ("Dust the cabinets")
▸ verb:  rub the dust over a surface so as to blur the outlines of a shape ("The artist dusted the charcoal drawing down to a faint image")
▸ verb:  cover with a light dusting of a substance ("Dust the bread with flour")
▸ verb:  distribute loosely
▸ name:  A surname (very rare: popularity rank in the U.S.: #40863)

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▸ Also see dust