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.
Origin of fly ash
First recorded in 1930–35
Words nearby fly ash
fluxion,
fluxionary hyperemia,
fluxmeter,
fly,
fly agaric,
fly ash,
fly at,
fly ball,
fly blind,
fly blister,
fly block
British Dictionary definitions for fly ash
fly ash
noun
fine solid particles of ash carried into the air during combustion, esp the combustion of pulverized fuel in power stations