Definition of ytterbium noun from the Oxford Advanced American Dictionary

 

ytterbium

 noun
noun
NAmE//ɪˈtərbiəm//
 
[uncountable](symbol Yb)
 
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a chemical element. Ytterbium is a silver-white metal used to make steel stronger and in some X-ray machines.
See the Oxford Advanced Learner's Dictionary entry: ytterbium