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WordReference Random House Unabridged Dictionary of American English © 2024ni•el•lo (nē el′ō),USA pronunciation n., pl. -el•li (-el′ē),USA pronunciation v., -el•loed, -el•lo•ing. n. - Metallurgy, Fine Arta black metallic substance, consisting of silver, copper, lead, and sulfur, with which an incised design or ground is filled to produce an ornamental effect on metal.
- Fine Artornamental work so produced.
- Fine Arta specimen of such work.
- Fine Art, Printinga print on paper made from an incised metal plate before the application of niello and associated esp. with 15th-century Italy.
v.t. - Fine Art, Printingto decorate by means of niello;
treat with niello or by the niello process.
- Latin nigellus blackish, diminutive of niger black
- Italian
- 1810–20
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