Ash may refer to: Products of fire, incineration or combustion The solid remains of a fire Incinerator bottom ash, a form of ash produced in incineration facilities Volcanic ash, material ejected from a volcano Ash (analytical chemistry), the compounds that remain after a scientific sample's burned Fly ash and bottom ash, products of coal combustion Wood ash, products of wood combustion Trees and shrubs Ash (tree), Fraxinus, a genus of large trees, originally and most commonly known by… (More on Ash)