| n. | 1. | The scum or refuse matter which is thrown off, or falls from, metals in smelting the ore, or in the process of melting; recrement. |
| 2. | Rust of metals. | |
| 3. | Waste matter; any worthless matter separated from the better part; leavings; dregs; refuse. |
| Noun | 1. | dross - worthless material that should be removed; "there were impurities in the water" Synonyms: impurity |
| 2. | dross - the scum formed by oxidation at the surface of molten metals |