Meanings
nounfly ash (uncountable)
- uncountableA 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.
Among new freight vehicles was a prototype 21-ton wagon with pressure discharge for the conveyance of fly ash from power stations, […]
1964 August, “BR [British Rail] in 1963 – ‘We have Turned the Financial Corner’”, in Modern Railways, Shepperton, Surrey: Ian Allan Publishing, →ISSN, →OCLC, page 1153 more examples
Heat exchangers should be kept free of debris to minimize the possibility of fire. Fly ash deposited in heat exchangers may cause nonuniform temperatures. Therefore, the exchangers should be disconnected and cleaned out regularly.
1956 December, Edmund F. Rasmussen [et al.], “Heating System”, in Inspection and Maintenance of Lumber Dry Kilns and Equipment: Information on Ways and Means of Keeping Lumber Dry Kilns Operating Efficiently (Report no. 1900-4), Madison, Wis.: Forest Products Laboratory, Forest Service, United States Department of Agriculture in association with the University of Wisconsin, →OCLC, page 19Furnaces and boilers with horizontal heating surfaces require frequent cleaning, because fly ash (fine powdery ash) collects on these surfaces.
1975 May, Joseph W[inslow] Simons, “Fuels and Burners”, in Home Heating: Systems, Fuels, Controls (Farmers’ Bulletin; no. 2235), Washington, D.C.: Agricultural Research Service, United States Department of Agriculture, →OCLC, page 19, column 2Besides our sending out of cement by rail, we also bring in pulverised fly-ash, typically once a week, which comes from Drax Power Station and is used in the cement manufacturing process, […]
2022 September 7, Gareth David, “Class 20 Stronghold in the Peak District”, in Rail, number 965, Peterborough, Cambridgeshire: Bauer Media, →ISSN, →OCLC, page 45Synonyms: flue ash
Synonyms & antonyms
nounA 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.
Similar
flue ash
Origin
From fly (“(obsolete) act of flying”, noun) + ash.
Full word history & related roots →Translations
Afrikaans vliegas
- vliegasresidue generated in the combustion of powdered coal or other materials, comprising the fine particles that rise with the flue gases
Arabic رماد متطاير
- رماد متطايرresidue generated in the combustion of powdered coal or other materials, comprising the fine particles that rise with the flue gases
Catalan cendra volant
- cendra volantresidue generated in the combustion of powdered coal or other materials, comprising the fine particles that rise with the flue gases
Chinese Mandarin 飛灰 /飞灰
- 飛灰 /飞灰 (fēihuī)residue generated in the combustion of powdered coal or other materials, comprising the fine particles that rise with the flue gases
Danish flyveaske
- flyveaskeresidue generated in the combustion of powdered coal or other materials, comprising the fine particles that rise with the flue gases
Dutch vliegas
- vliegasresidue generated in the combustion of powdered coal or other materials, comprising the fine particles that rise with the flue gases
Esperanto flugcindro
- flugcindroresidue generated in the combustion of powdered coal or other materials, comprising the fine particles that rise with the flue gases
Estonian lendtukh
- lendtukhresidue generated in the combustion of powdered coal or other materials, comprising the fine particles that rise with the flue gases
Finnish lentotuhka
- lentotuhkaresidue generated in the combustion of powdered coal or other materials, comprising the fine particles that rise with the flue gases
French cendre volante
- cendre volanteresidue generated in the combustion of powdered coal or other materials, comprising the fine particles that rise with the flue gases
German Flugasche
- Flugascheresidue generated in the combustion of powdered coal or other materials, comprising the fine particles that rise with the flue gases
Hebrew אפר פחם
- אפר פחם (éfer pekhám)residue generated in the combustion of powdered coal or other materials, comprising the fine particles that rise with the flue gases
Hindi उड़न राख
- उड़न राख (uṛan rākh)residue generated in the combustion of powdered coal or other materials, comprising the fine particles that rise with the flue gases
Indonesian abu terbang
- abu terbangresidue generated in the combustion of powdered coal or other materials, comprising the fine particles that rise with the flue gases
Italian cenere volante
- cenere volanteresidue generated in the combustion of powdered coal or other materials, comprising the fine particles that rise with the flue gases
Japanese フライアッシュ
- フライアッシュ (furaiasshu)residue generated in the combustion of powdered coal or other materials, comprising the fine particles that rise with the flue gases
Norwegian Bokmål flygeaske
- flygeaskeresidue generated in the combustion of powdered coal or other materials, comprising the fine particles that rise with the flue gases
Persian خاکستر بادی
- خاکستر بادیresidue generated in the combustion of powdered coal or other materials, comprising the fine particles that rise with the flue gases
Polish popiół lotny
- popiół lotnyresidue generated in the combustion of powdered coal or other materials, comprising the fine particles that rise with the flue gases
Portuguese cinzas volantes
- cinzas volantesresidue generated in the combustion of powdered coal or other materials, comprising the fine particles that rise with the flue gases
Russian лету́чая зола́, зола́-уноса
- лету́чая зола́ (letúčaja zolá)residue generated in the combustion of powdered coal or other materials, comprising the fine particles that rise with the flue gases
- зола́-уноса (zolá-unosa)residue generated in the combustion of powdered coal or other materials, comprising the fine particles that rise with the flue gases
Spanish cenizas volantes
- cenizas volantesresidue generated in the combustion of powdered coal or other materials, comprising the fine particles that rise with the flue gases
Swedish flygaska
- flygaskaresidue generated in the combustion of powdered coal or other materials, comprising the fine particles that rise with the flue gases
Tamil எரி சாம்பல்
- எரி சாம்பல் (eri cāmpal)residue generated in the combustion of powdered coal or other materials, comprising the fine particles that rise with the flue gases
Thai เถ้าลอย
- เถ้าลอยresidue generated in the combustion of powdered coal or other materials, comprising the fine particles that rise with the flue gases
Turkish uçucu kül
- uçucu külresidue generated in the combustion of powdered coal or other materials, comprising the fine particles that rise with the flue gases
Ukrainian зола́ ви́носу
- зола́ ви́носу (zolá výnosu)residue generated in the combustion of powdered coal or other materials, comprising the fine particles that rise with the flue gases
Vietnamese tro bay
- tro bayresidue generated in the combustion of powdered coal or other materials, comprising the fine particles that rise with the flue gases
Cite this entry
APA
fly ash. (n.d.). In WatkinsX Dictionary. Retrieved November 3, 2026, from https://dictionary.watkinsx.com/word/fly%20ash
MLA
“fly ash.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/fly%20ash. Accessed November 3, 2026.
Chicago
WatkinsX Dictionary, s.v. “fly ash,” accessed November 3, 2026, https://dictionary.watkinsx.com/word/fly%20ash.
Source: fly ash on Wiktionary, CC BY-SA 4.0.