Home › Words › U › ununbiumununbiumununbium means the former systematic element name for the chemical element with atomic number 112 (symbol Uub), which has been officially changed to copernicium.EtymologySystematic element name, from un- + un- + bi- + -ium.nounThe former systematic element name for the chemical element with atomic number 112 (symbol Uub), which has been officially changed to copernicium.Definitions & examples from Wiktionary (CC BY-SA 3.0).