| Word | Definitions | Synonyms |
|---|---|---|
| zirconium | (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 | Synonyms: atomic number 40, Zr |
| zoarium | (noun) a colony of zooids. | - |