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| un·un·un·i·um [ ùn un únnee əm ] |
noun |
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| Definition: |
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artificially produced chemical element: a highly unstable radioactive chemical element, produced artificially by nuclear fusion, with an atomic number of 111.
Symbol Uuu
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| [Late 20th century. < Latin unus "one" (repeated), representing 111, its atomic number] |
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