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fly ash
noun
- fine particles of ash of a solid fuel carried out of the flue of a furnace with the waste gases produced during combustion.
- such ash recovered from the waste gases, used chiefly as a reinforcing agent in the manufacture of bricks, concrete, etc.
fly ash
noun
- fine solid particles of ash carried into the air during combustion, esp the combustion of pulverized fuel in power stations
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Word History and Origins
Origin of fly ash1
First recorded in 1930–35
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