Metallic refuse, also known as DROSS (5 letters), is a by-product of metal smelting or refining processes. It is composed of the impurities and nonmetallic particles that are left over after the desired metal has been separated from its raw ore. DROSS is usually classified as either a solid waste or a hazardous waste, depending on its composition. It can be recycled to recover valuable metals, or it can be disposed of in a landfill.