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

 

hassium

 noun
noun
BrE BrE//ˈhæsiəm//
 
; NAmE NAmE//ˈhæsiəm//
 
[uncountable](symbol Hs)
 
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a chemical element. Hassium is produced when atoms collide (= crash into each other). Word Originmodern Latin, from Latin Hassias ‘Hesse’ (the German state); it was discovered in Darmstadt in 1984.
See the Oxford Advanced American Dictionary entry: hassium