Home › Words › U › untrihexiumuntrihexiumuntrihexium means the systematic element name for the (as yet undiscovered) chemical element with atomic number 136 (symbol Uth).Among words judged in Lexicurio's Arena, untrihexium ranks #32,478 of 42,747 for Qualifying.EtymologySystematic element name, from un- + tri- + hex- + -ium.nounThe systematic element name for the (as yet undiscovered) chemical element with atomic number 136 (symbol Uth).Definitions & examples from Wiktionary (CC BY-SA 3.0).