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| actinium [æk'tɪnɪəm] n | |
| chem. | aktínium |
| actinium A radioactive element of the actinide series, occurring as a decay product of uranium. It is used as an alpha particle source and in neutron production n | |
| environ. | aktinoidy |
| English thesaurus | |
| Actinium [æk'tɪnɪəm] abbr. | |
| abbr., scottish | Ac |