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 actinium [æk'tɪnɪəm] n
chem. actiniu
 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. actiniu
 English thesaurus
 Actinium [æk'tɪnɪəm] abbr.
abbr., scottish Ac