WordReference Random House Unabridged Dictionary of American English © 2025
zirconium oxide, 
    [Chem.]a white, heavy, amorphous, odorless and tasteless, infusible, water-insoluble powder, ZrO2, used chiefly as a pigment for paints, an abrasive, and in the manufacture of refractory crucibles. Also called zir•co•ni•a  (zûr kōnē ə),USA pronunciation zirconium dioxide. 
    • 1865–70

Collins Concise English Dictionary © HarperCollins Publishers::
zirconium oxide
  1. a white amorphous powder that is insoluble in water and highly refractory, used as a pigment for paints, a catalyst, and an abrasive. Formula: ZrO2
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