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

 

terbium

 noun
noun
BrE BrE//ˈtɜːbiəm//
 
; NAmE NAmE//ˈtɜːrbiəm//
 
[uncountable](symbol Tb)
 
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a chemical element. Terbium is a silver-white metal used in lasers, X-rays and television tubes. Word Origin mid 19th cent.: modern Latin, from Ytterby, the name of a village in Sweden where it was discovered. Compare with erbium and ytterbium.
See the Oxford Advanced American Dictionary entry: terbium