fly ash


noun

  1. fine particles of ash of a solid fuel carried out of the flue of a furnace with the waste gases produced during combustion.
  2. such ash recovered from the waste gases, used chiefly as a reinforcing agent in the manufacture of bricks, concrete, etc.

noun

  1. fine solid particles of ash carried into the air during combustion, esp the combustion of pulverized fuel in power stations

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