1. transactinide - Noun
2. transactinide - Adjective
any of the artificially produced elements with atomic numbers greater than 103
of or belonging to the elements with atomic numbers greater than 103
Source: WordNetHe predicted the existence of elements beyond those on the periodic table, citation the transactinide series and the superactinide series of undiscovered synthetic elements. Source: Internet
Super-heavy elements, (also known as super heavy atoms, commonly abbreviated SHE) usually refer to the transactinide elements beginning with rutherfordium (atomic number 104). Source: Internet