#dust  fine powdery material such as dry earth or pollen that can be blown about in the air; "the furniture was covered with dust"
  supertype:  #dirt__soil  the part of the earth's surface consisting of humus and disintegrated rock
  subtype:  #chalk_dust__chalkdust  dust resulting from writing with a piece of chalk; "the teacher's hands were covered with chalk dust"
  subtype:  #fallout__radioactive_dust__radioactivedust  the radioactive particles that settle to the ground after a nuclear explosion

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