zircon | (noun) a common mineral occurring in small crystals; chief source of zirconium; used as a refractory when opaque and as a gem when transparent | Synonyms: zirconium silicate |
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zirconia | (noun) a white crystalline oxide; used in refractories and in insulation and abrasives and enamels and glazes | Synonyms: zirconium dioxide, zirconium oxide |
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zirconium | (noun) a lustrous grey strong metallic element resembling titanium; it is used in nuclear reactors as a neutron absorber; it occurs in baddeleyite but is obtained chiefly from zircon | Synonyms: atomic number 40, Zr |
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