thulium
/ˈθjuːlɪəm/noun
mass noun
- the chemical element of atomic number 69, a soft silvery-white metal of the lanthanide series. (Symbol: Tm)（化学元素）铥（符号：Tm）。
词源
late 19th cent.: modern Latin， from Latin Thule （see sense 1 of THULE）， from Greek Thoulē, of unknown origin.