superheavy adjective 3noun 3forms 1 adjective3 •Much heavier than usual.The superheavy tank weighed 80 tonnes and was said to be indestructible in combat. •Describing a transuranic element with an extremely high atomic number; typically taken to mean beyond lawrencium (element 103, the last actinide). •stressed more than is usual noun3 •A superheavy thing. •A superheavy element. •(informal) A superheavy tank or artillery piece. formssuperheavies
