niello Meaning, Definition & Usage

Ni*el"lo noun
Etymology
It. niello, LL. nigellum a black of blackish enamel, fr. L. nigellus, dim. of niger black. See Negro, and cf. Anneal.
Definitions
  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