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Actinium

//ækˈtɪniəm// noun

Definitions

Noun
  1. 1
    A radioactive, metallic chemical element (symbol: Ac) with an atomic number of 89; found in uranium ores. uncountable, usually
  2. 2
    a radioactive element of the actinide series; found in uranium ores wordnet

Etymology

Borrowed from French actinium. actin- + -ium.

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