nickelous

from The American Heritage® Dictionary of the English Language, 5th Edition.

• adjective Containing nickel, especially of valence 2.

from The Century Dictionary.

• Related to or containing nickel.

from the GNU version of the Collaborative International Dictionary of English.

• adjective (Chem.) Of, pertaining to, or designating, those compounds of nickel in which, as contrasted with the nickelic compounds, the metal has a lower valence.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• adjective Containing nickel.
• adjective chemistry Containing bivalent nickel.