nielloPronunciation: /nɪˈɛləʊ/Definition of niello noun [mass noun] a black compound of sulphur with silver, lead, or copper, used for filling in engraved designs in silver or other metals: [as modifier]:niello inlay objects decorated with niello: on the Continent niello was always highly desirableDerivatives nielloed adjective Origin: early 19th century: from Italian, from Latin nigellus, diminutive of niger 'black'niello in other Oxford dictionaries Definition of niello in the US English dictionary
