| Chemistry. 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. |
[zur-koh-nee-uh] 
, zirconium dioxide.
| zirconium oxide n. A hard white amorphous powder, ZrO2, derived from zirconium and also found naturally, used chiefly in pigments, refractories, and ceramics and as an abrasive. |