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

 

hafnium

 noun
noun
BrE BrE//ˈhæfniəm//
 
; NAmE NAmE//ˈhæfniəm//
 
[uncountable](symbol Hf)
 
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a radioactive chemical element. Hafnium is a hard silver-grey metal. Word Origin 1920s: modern Latin, from Hafnia, Latinized form of Danish Havn, former name of Copenhagen.
See the Oxford Advanced American Dictionary entry: hafnium