free microscopic particles of solid material(noun.substance)
Example: Astronomers say that the empty space between planets actually contains measurable amounts of dust.
source: wordnet30
Fine, dry particles of earth or other matter, so comminuted that they may be raised and wafted by the wind; that which is crumbled to minute portions; fine powder; as, clouds of dust; bone dust.(noun)
source: webster1913
verb (v)
remove the dust from(verb.contact)
Example: Dust the cabinets.
source: wordnet30
rub the dust over a surface so as to blur the outlines of a shape(verb.contact)
Example: The artist dusted the charcoal drawing down to a faint image.
source: wordnet30
cover with a light dusting of a substance(verb.contact)