nickelic

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

• adjective Containing nickel, especially of valence 3.

from The Century Dictionary.

• Pertaining to or containing nickel.

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

• adjective (Chem.) Pertaining to, or containing, nickel; specifically, designating compounds in which, as contrasted with the nickelous compounds, the metal has a higher valence.

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

• adjective Containing nickel.
• adjective chemistry Containing trivalent nickel.