English

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

 

deuterium

 noun
noun
BrE BrE//djuːˈtɪəriəm//
 
; NAmE NAmE//djuːˈtɪriəm//
 
, NAmE//duːˈtɪriəm//
 
[uncountable] (symbol D) (chemistry)
 
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an isotope (= a different form) of hydrogen with twice the mass of the usual isotope Word Origin 1930s: modern Latin, from Greek deuteros ‘second’.
See the Oxford Advanced American Dictionary entry: deuterium