Home › Words › L › livermoriumlivermorium/ˌlɪvəɹˈmɔːɹiəm/livermorium · noun — the chemical element with atomic number 116.Definition from Wiktionary (CC BY-SA 3.0).livermorium is pronounced /ˌlɪvəɹˈmɔːɹiəm/.EtymologyFrom Livermore + -ium, after the Lawrence Livermore National Laboratory.nounThe chemical element with atomic number 116.Definitions & examples from Wiktionary (CC BY-SA 3.0).