RhymeZone: superheavy definitions

Definitions of superheavy:

adjective: Having far greater weight than usual.
adjective: (physics) Describing a transuranic element with an extremely high atomic number; typically taken to mean beyond lawrencium (element 103, the last actinide)
adjective: (linguistics, of a syllable) stressed more than is usual
noun: (physics) A superheavy element.

(Definitions from Wiktionary)