(US, informal) A small clump of dust, fluff, hair, particles of skin, etc., that tends to accumulate indoors in areas not regularly dusted, such as under heavy furniture.

A small atmospheric vortex appearing in clear, dry conditions, made visible by swirling dust picked up from the ground.

(US) A powder used to cast a spell in hoodoo practices.

(fantasy) Magical dust associated with pixies; fairy dust. / (figuratively) Any undefined means of working magic, in a metaphorical sense.

A magical powder that would give the power of flight to whoever it was sprinkled on. / (by extension) Any apparently magical ingredient or effect. / (slang) The drug phencyclidine.

Alternative spelling of smartdust

(idiomatic) To remain untouched and unused for a long period of time.

(Britain) Alternative spelling of dustbin

plural of dustbins

(slang) Phencyclidine, a type of dissociative anesthetic. / (Ireland, slang) Clenbuterol, a banned growth hormone formerly used in animal feedlots.