atomic number 40

Từ điển WordNet v3.1 - WordNet Dictionary

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