Source : Webster's Revised Unabridged Dictionary (1913)

Zirconia \Zir*co"ni*a\, n. [NL.] (Chem.)
   The oxide of zirconium, obtained as a white powder, and
   possessing both acid and basic properties. On account of its
   infusibility, and brilliant luminosity when incandescent, it
   is used as an ingredient of sticks for the Drummomd light.

Source : WordNet®

zirconia
     n : a white crystalline oxide; used in refractories and in
         insulation and abrasives and enamels and glazes [syn: {zirconium
         oxide}, {zirconium dioxide}]