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