zir·co·ni·um  (zûr-kō'nē-əm)  n. Symbol Zr A lustrous, grayish-white, strong, ductile metallic element obtained primarily from zircon and used chiefly in ceramic and refractory compounds, as an alloying agent, and in nuclear reactors as a highly corrosion-resistant alloy. Atomic number 40; atomic weight 91.22; melting point 1,852°C; boiling point 4,377°C; specific gravity 6.56 (20°C); valence 2, 3, 4. See Table at element. |
| Zr The symbol for the element zirconium. |
Zr
The symbol for the element zirconium.
zr networking
The old country code for Zaire.
"cd" is now used instead, since Zaire changed its name to the Democratic Republic of the Congo.
(1999-01-27)
| Zr zirconium |
