superheavy

Adjective

 * 1) Much heavier than usual.
 * The superheavy tank weighed 80 tonnes and was said to be indestructible in combat.
 * 1)  Describing a transuranic element with an extremely high atomic number; typically taken to mean beyond lawrencium (element 103, the last actinide)
 * 2)  stressed more than is usual

Noun

 * 1)  A superheavy element.

Usage notes
It has been suggested that elements beyond #126 (unbihexium, Ubh) be called "beyond superheavy".