WordReference Random House Unabridged Dictionary of American English © 2026
nickel′ic ox′ide, [Chem.]
  1. Chemistrya gray-black, water-insoluble powder, Ni2O3, which, at 600°C, decomposes to nickel oxide: used chiefly in storage batteries as an oxidizing agent. Also called black nickel oxide, nickel sesquioxide. 

'nickelic oxide' also found in these entries (note: many are not synonyms or translations):
black nickel oxide - nickel sesquioxide

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