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radioactinium [ˌreɪdiəʊæk'tɪniəm, -oʊ-] n
chem. RdAc; radioaktinium
 English thesaurus
radioactinium [ˌreɪdiəʊæk'tɪniəm, -oʊ-] abbr.
abbr. Th227 (Rd Ac)