ununseptium

un·un·sep·ti·um
U1N1U1N1S1E1P3T1I1U1M3
/uːnuːnˈsɛpti.əm/

noun

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

Scrabble 15
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Meanings

nounununseptium (uncountable)
  1. dateduncountableThe systematic element name for the chemical element with atomic number 117 (symbol Uus). The element is now named tennessine.
    1 more example

    “The chemistry community is eager to see its most cherished table finally being completed down to the seventh row. IUPAC has now initiated the process of formalizing names and symbols for these elements temporarily named as ununtrium, (Uut or element 113), ununpentium (Uup, element 115), ununseptium (Uus, element 117), and ununoctium (Uuo, element 118)” said Professor Jan Reedijk, President of the Inorganic Chemistry Division of IUPAC.

    2015 December 30, “Discovery and Assignment of Elements with Atomic Numbers 113, 115, 117 and 118”, in IUPAC

Synonyms & antonyms

Also see
tennessine

Origin

Systematic element name, from un- + un- + sept- + -ium.

Full word history & related roots →

Translations

Arabic أُنُون سِيبْتِيُوم
  • أُنُون سِيبْتِيُوم (ʔunun sibtiyum)element with atomic number 117
Catalan ununsepti
  • ununseptielement with atomic number 117
Dutch ununseptium
  • ununseptiumelement with atomic number 117
Esperanto ununseptio
  • ununseptioelement with atomic number 117
Estonian ununseptium
  • ununseptiumelement with atomic number 117
Finnish ununseptium
  • ununseptiumelement with atomic number 117
French ununseptium
  • ununseptiumelement with atomic number 117
German Ununseptium
  • Ununseptiumelement with atomic number 117
Greek ουνουνσέπτιο
  • ουνουνσέπτιο (ounounséptio)element with atomic number 117
Hungarian ununseptium
  • ununseptiumelement with atomic number 117
Italian ununseptio
  • ununseptioelement with atomic number 117
Korean 우눈셉튬
  • 우눈셉튬 (ununseptyum)element with atomic number 117
Malay ununseptium
  • ununseptiumelement with atomic number 117
Norwegian ununseptium
  • ununseptiumelement with atomic number 117
Polish ununseptium
  • ununseptiumelement with atomic number 117
Portuguese ununséptio
  • ununséptioelement with atomic number 117
Romanian ununseptiu
  • ununseptiuelement with atomic number 117
Russian унунсе́птий
  • унунсе́птий (ununséptij)element with atomic number 117
Spanish ununseptio
  • ununseptioelement with atomic number 117
Swedish ununseptium
  • ununseptiumelement with atomic number 117
Thai อูนอูนเซปเทียม
  • อูนอูนเซปเทียม (ūnūnsêptiam)element with atomic number 117
Ukrainian унунсе́птій
  • унунсе́птій (ununséptij)element with atomic number 117
Cite this entry
APA

ununseptium. (n.d.). In WatkinsX Dictionary. Retrieved November 4, 2026, from https://dictionary.watkinsx.com/word/ununseptium

MLA

“ununseptium.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/ununseptium. Accessed November 4, 2026.

Chicago

WatkinsX Dictionary, s.v. “ununseptium,” accessed November 4, 2026, https://dictionary.watkinsx.com/word/ununseptium.

Source: ununseptium on Wiktionary, CC BY-SA 4.0.