/ Dictionary / Index N nickel oxide: Meaning and Definition of Find definitions for: nick'el ox'ide Pronunciation: [key] — Chem. Chem. a green, water-insoluble powder, NiO, used chiefly in the manufacture of nickel salts and in green pigments for ceramic paints. Also called Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. nickelous nickel plate Related Content Daily Word Quiz: mamba Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language