Noun zr has 1 sense
  1. zirconium, Zr, atomic number 40 - a lustrous gray 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
    --1 is a kind of metallic element, metal
    --1 is a substance of baddeleyite; zircon, zirconium silicate
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