Usually means: Synthetic chemical element, atomic number 117.
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We found 3 dictionaries that define the word ununseptium:

General (3 matching dictionaries)
  1. ununseptium: Wordnik
  2. ununseptium: Wiktionary
  3. Ununseptium: Wikipedia, the Free Encyclopedia

Definitions from Wiktionary (ununseptium)

noun:  (dated) The systematic element name for the chemical element with atomic number 117 (symbol Uus). The element is now named tennessine.

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