fly' ash"

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.

Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.

fly agaricflyaway
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