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

 

thulium

 noun
noun
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 Origin late 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