Children's, Intermediate and Advanced Online English Dictionary & Thesaurus

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Ash Wednesday the first day of Lent, on which some Christians put ashes on their foreheads as a sign of penitence.
fly ash fine, often airborne particles of ash derived from the burning of solid fuel and recognized as a factor in air pollution. [2 definitions]
mountain ash any of several usu. ornamental trees of the rose family, bearing clusters of white flowers and red or orange berries.
pearl ash a white powdery substance used to manufacture soap, glass, and the like; potassium carbonate.
soda ash crude sodium carbonate, used in water treatment and the manufacture of industrial products.