Wiktionary:Word of the day/2023/December 22

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fly ash n

A residue generated in the combustion of powdered coal or other materials, comprising the fine particles that rise with the flue gases; when generated industrially it is usually captured and can be recycled for use in construction materials. A dike ruptured at a coal ash pond operated by the Kingston Fossil Plant, a coal-fired power plant in Kingston, Tennessee, on this day 15 years ago in 2008, releasing 4.2 million cubic metres of fly ash slurry. It was the largest industrial spill in United States history.

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