What does "superactinide" mean?

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.

Superactinide

noun

noun ·Rare ·Advanced level

Definitions

Noun

1
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.

Etymology

From super- + actinide.

Related phrases

chemical element

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Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.