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unutterable
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ununhexium

un·un·hex·i·um [ ùn un héksee əm ]


noun 
Definition:
 
artificially produced chemical element: a highly unstable, artificially produced radioactive chemical element with an atomic number of 116.
Symbol  Uuh


[Late 20th century. < Latin unus "one" (repeated) + Greek hex "six," representing 116, its atomic number]
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