noun, plural nielli /niˈɛli/ [nee-el-ee] Show IPA .
a 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.
ornamental work so produced.
a specimen of such work.
a print on paper made from an incised metal plate before the application of niello and associated especially with 15th-century Italy.
verb (used with object), nielloed, nielloing.
to decorate by means of niello; treat with niello or by the niello process.
Origin: Related forms
1810–20; < Italian < Latin nigellus blackish, diminutive of niger black