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BNC: 30824 COCA: 29184

tritium

noun
/ˈtrɪtiəm/
/ˈtrɪtiəm/
[uncountable]
(symbol T)
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  1. an isotope (= a different form) of hydrogen with a mass that is three times that of the usual isotope氚(氢的同位素)
    Word Origin1930s: from modern Latin, from Greek tritos ‘third’.

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