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

 

dubnium

 noun
noun
BrE BrE//ˈdʌbniəm//
 
; NAmE NAmE//ˈduːbniəm//
 
[uncountable](symbol Db)
 
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a radioactive chemical element. Dubnium is produced when atoms collide (= crash into each other). Word Origin 1990s: modern Latin, from Dubna in Russia, site of the Joint Nuclear Institute.
See the Oxford Advanced American Dictionary entry: dubnium