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Definition of tantalum noun from the Oxford Advanced American Dictionary

 

tantalum

 noun
noun
NAmE//ˈtæntl̩əm//
 
[uncountable] (symbol Ta)
 
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a chemical element. Tantalum is a hard silver-gray metal used in the production of electronic parts and of metal plates and pins for connecting broken bones.
See the Oxford Advanced Learner's Dictionary entry: tantalum