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



BrE BrE//ˈtrɪtiəm//
; NAmE NAmE//ˈtrɪtiəm//
[uncountable](symbol T)
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an isotope (= a different form) of hydrogen with a mass that is three times that of the usual isotope Word Origin 1930s: from modern Latin, from Greek tritos ‘third’.
See the Oxford Advanced American Dictionary entry: tritium