Having far greater weight than usual. / (physics) Describing a transuranic element having an atomic number greater than 110 / (linguistics, of a syllable) stressed more than is usual

(physics) Any superheavy element.

plural of superheavy

Alternative form of super-heavy water

(boxing) Of or pertaining to the weight class for boxers exceeding 91 kilograms in body weight.

A boxer of the superheavyweight class / Someone or something that is extremely heavy or hefty

plural of superheavyweight