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From The Collaborative International Dictionary of English v.0.48:
Niello \Ni*el"lo\, n. [It. niello, LL. nigellum a black of blackish enamel, fr. L. nigellus, dim. of niger black. See Negro, and cf. Anneal.] 1. A metallic alloy of a deep black color. [1913 Webster] 2. The art, process, or method of decorating metal with incised designs filled with the black alloy. [1913 Webster] 3. A piece of metal, or any other object, so decorated. [1913 Webster] 4. An impression on paper taken from an ancient incised decoration or metal plate. [1913 Webster] 5. An impression on paper taken from the engraved or incised surface before the niello alloy has been inlaid. [Webster 1913 Suppl.]