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.
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.
© Webster 1913
Ni*el"lo (?), n.
An impression on paper taken from the engraved or incised surface before the niello alloy has been inlaid.
© Webster 1913