adjective, superheavier, superheaviest.
Chemistry, Physics. pertaining to any of a series of elements having an atomic number greater than 103.
heavier than usual for its kind: a superheavy oil; superheavy magnetic monopoles. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
superheavy (ˌsuːpəˈhɛvɪ)
physics denoting or relating to elements of high atomic number (above 109) postulated to exist with special stability as a consequence of the shell model of the nucleus

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences for superheavy
This synthetic element is one of the socalled superheavy atoms.
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