fine powdery material such as dry earth or pollen that can be blown about in the air; "the furniture was covered with dust"
debris: the remains of something that has been destroyed or broken up
free microscopic particles of solid material; "astronomers say that the empty space between planets actually contains measurable amounts of dust"
Dust is a general name for minute solid particles of diameters less than 500 micrometers (otherwise see sand or granulates) and, more generally, for finely divided matter. On Earth, dust occurs in the atmosphere from various sources: soil dust lifted up by wind, volcanic eruptions, and pollution are some examples; airborne dust is considered an aerosol and can have a strong, local radiative forcing on the atmosphere and significant effects on climate. ...
