Definition of tritium in English:


Syllabification: trit·i·um
Pronunciation: /ˈtritēəm, ˈtriSH-


  • A radioactive isotope of hydrogen with a mass approximately three times that of the common protium isotope. (Symbol: T)

    Discovered in 1934, tritium has two neutrons as well as a proton in the nucleus. It occurs in minute traces in nature and can be made artificially from lithium or deuterium in nuclear reactors; it is used as a fuel in thermonuclear bombs

    More example sentences
    • Although many nuclei can be fused, this subject normally refers to fusion of hydrogen isotopes deuterium or tritium to form helium.
    • Although tritium can be a gas, its most common form is in water, because, like non-radioactive hydrogen, radioactive tritium reacts with oxygen to form water.
    • These products contain tiny glass vials filled with a radioactive gas such as tritium.


1930s: from modern Latin, from Greek tritos 'third'.

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Pronunciation: skəʊʃ
a small amount; a little