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1. Oxford American Dictionary

   actinium

   • IPA[akˈtinēəm]

   美式

   • n.
     the chemical element of atomic number 89, a radioactive metallic element of the actinide series. It is rare in nature, occurring as an impurity in uranium ores.

   • noun: actinium

2. • 更多解釋

   actinium

   • IPA[akˈtɪnɪəm]

   英式

   • n.
     the chemical element of atomic number 89, a radioactive metallic element of the actinide ...

   Oxford Dictionary