Definitions from Wiktionary (superheavy)

▸ adjective:  Much heavier than usual.
▸ adjective:  (nuclear 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:  (nuclear physics) A superheavy element.

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