particulate matter

Definitions of particulate matter
  1. noun
    a small discrete mass of solid or liquid matter that remains individually dispersed in gas or liquid emissions (usually considered to be an atmospheric pollutant)
    synonyms: particulate
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    fine powdery material such as dry earth or pollen that can be blown about in the air
    chalk dust
    dust resulting from writing with a piece of chalk
    fallout, radioactive dust
    the radioactive particles that settle to the ground after a nuclear explosion
    type of:
    material, stuff
    the tangible substance that goes into the makeup of a physical object
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