Definition of thulium noun from the Oxford Advanced Learner's Dictionary



BrE BrE//ˈθuːliəm//
, also BrE//ˈθjuːliəm//
; NAmE NAmE//ˈθuːliəm//
[uncountable] (symbol Tm)
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a chemical element. Thulium is a soft silver-white metal. Word Originlate 19th cent.: modern Latin, from Latin Thule (a country described by the ancient Greek explorer Pytheas), from Greek Thoulē, of unknown origin.
See the Oxford Advanced American Dictionary entry: thulium