A hard malleable ductile silvery metallic element that is resistant to corrosion; used in alloys; occurs in pentlandite and smaltite and garnierite and millerite WordNet 3.0 & Open English WordNet

Nickel is a chemical element; it has symbol Ni and atomic number 28. Wikipedia

Chemical element. Wikipedia Disambiguation

Chemical element with symbol Ni and atomic number 28 Wikidata

A malleable ductile silvery-white metallic element that is strong and corrosion-resistant, occurring principally in pentlandite and niccolite: used in alloys, especially in toughening steel, in electroplating, and as a catalyst in organic synthesis. OmegaWiki

A silvery elemental metal with an atomic number of 28 and symbol Ni. Wiktionary