superactinide (English, noun)
expansion: superactinide (plural superactinides)
Senses:
topics: chemistry
natural-sciences
physical-sciences
glosses: 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.
Forms:
form: superactinides
tags: plural