superactinide

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noun

Any of the undiscovered chemical elements from unbiunium (121) to perhaps unpentseptium (157), following the transactinides. These will presumably go below the actinides in the periodic table.

OriginEnglish actinide ← Latin super- ← Proto-Italic *super →
Scrabble 18
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Meanings

nounsuperactinide (plural superactinides)

plural superactinides

  1. chemistryAny of the undiscovered chemical elements from unbiunium (121) to perhaps unpentseptium (157), following the transactinides. These will presumably go below the actinides in the periodic table.

Origin

  1. Proto-Indo-European*úp
  2. Proto-Indo-European*upér
  3. Proto-Italic*super
  4. Latinsuper
  5. Latinsuper-
  6. Englishsuper-
  7. Englishactinide
  8. Englishsuperactinide

From super- + actinide.

Full word history & related roots →
Cite this entry
APA

superactinide. (n.d.). In WatkinsX Dictionary. Retrieved November 2, 2026, from https://dictionary.watkinsx.com/word/superactinide

MLA

“superactinide.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/superactinide. Accessed November 2, 2026.

Chicago

WatkinsX Dictionary, s.v. “superactinide,” accessed November 2, 2026, https://dictionary.watkinsx.com/word/superactinide.

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