adjective, su·per·heav·i·er, su·per·heav·i·est.

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 Unabridged Dictionary, © Random House, Inc. 2019

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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 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012