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zirconia

Flag: gbEnglishOxford Dictionary of English
zirconia /zəːˈkəʊniə /
▸ noun [mass noun] zirconium dioxide, a white solid used in ceramic glazes and refractory coatings, and as a synthetic substitute for diamonds in jewellery.
Chemical formula: ZrO2.
– ORIGIN late 18th century: from zircon + -ia1.