Yahoo奇摩字典 網頁搜尋

搜尋結果

1. Oxford American Dictionary

   protactinium

   • IPA[ˌprōtakˈtinēəm]

   美式

   • n.
     the chemical element of atomic number 91, a radioactive metal of the actinide series, occurring in small amounts as a product of the natural decay of uranium.

   • noun: protactinium

2. • 更多解釋

   protactinium

   • IPA[ˌprəʊtakˈtɪnɪəm]

   英式

   • n.
     the chemical element of atomic number 91, a radioactive metal of the actinide series, occurring ...

   Oxford Dictionary