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