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From The Collaborative International Dictionary of English v.0.48:
Zirconium \Zir*co"ni*um\, n. [NL.] (Chem.) A rare element of the carbon-silicon group, intermediate between the metals and nonmetals, obtained from the mineral zircon as a dark sooty powder, or as a gray metallic crystalline substance. Symbol Zr. Atomic weight, 90.4. [1913 Webster]