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