#1 dust n. fine powdery material such as dry earth or pollen that can be blown about in the air; "the furniture was covered with dust". wn
#2 dust n. [debris, junk, rubble, detritus] the remains of something that has been destroyed or broken up. wn
#3 dust v. remove the dust from; "dust the cabinets". wn
#4 dust v. 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". wn
#5 dust n. free microscopic particles of solid material; "astronomers say that the empty space between planets actually contains measurable amounts of dust". wn
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