ACTINIUM


Meaning of ACTINIUM in English

/ ækˈtɪniəm; NAmE / noun

[ U ] ( symb Ac ) a chemical element. Actinium is a radioactive metal.

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WORD ORIGIN

early 20th cent.: from Greek aktis , aktin- ray + -ium , used to form names of metallic elements.

Oxford Advanced Learner's English Dictionary.      Оксфордский английский словарь для изучающик язык на продвинутом уровне.