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Hint: Question mark (?) is a wildcard. Question mark substitutes one character.
English
noun
:
zirconium dioxide
1.
zirconium dioxide
(substance)
a white crystalline oxide; used in refractories and in insulation and abrasives and enamels and glazes
Synonyms
zirconia
,
zirconium oxide
Broader (hypernym)
oxide
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