| n. | 1. | A metallic alloy of a deep black color. |
| 2. | The art, process, or method of decorating metal with incised designs filled with the black alloy. |
| 3. | A piece of metal, or any other object, so decorated. |
| 4. | An impression on paper taken from an ancient incised decoration or metal plate. |
| 5. | An impression on paper taken from the engraved or incised surface before the niello alloy has been inlaid. |