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

 

rhenium

 noun
noun
BrE BrE//ˈriːniəm//
 
; NAmE NAmE//ˈriːniəm//
 
[uncountable](symbol Re)
 
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a chemical element. Rhenium is a rare silver-white metal that exists naturally in the ores of molybdenum and some other metals. Word Origin 1920s: modern Latin, from Rhenus, the Latin name of the River Rhine.
See the Oxford Advanced American Dictionary entry: rhenium