zirconium 
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 • Syn: Zr, atomic number 40 • Hypernyms: metallic element, metal • Substance Holonyms: baddeleyite, zircon, zirconium silicate
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