Home › Words › F › fermiumfermium/ˈfɜːɹmiəm/fermium means A transuranic chemical element (symbol Fm) with an atomic number of 100.fermium is pronounced /ˈfɜːɹmiəm/.EtymologyFrom Fermi + -ium; named for Enrico Fermi.nounA transuranic chemical element (symbol Fm) with an atomic number of 100.Definitions & examples from Wiktionary (CC BY-SA 3.0).