1.Definition: fine powdery material such as dry earth or pollen that can be blown about in the air

"The furniture was covered with dust"

Category: General

2.Definition: free microscopic particles of solid material

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

Category: General

3.Definition: the remains of something that has been destroyed or broken up

Related Noun(s):debris, detritus, junk, rubble

Category: General