drossn. 浮渣、碎屑、渣滓學術名詞浮渣：化學術語、礦冶工程、金屬材料、機械工程、鑄造學細矸煤：礦冶工程回爐渣：礦冶工程英文釋義worthless or dangerous material that should be removedthe scum formed by oxidation at the surface of molten metals