Definition of protium in English:


Syllabification: pro·ti·um
Pronunciation: /ˈprōtēəm, ˈprōSH(ē)əm


  • The common, stable isotope of hydrogen, as distinct from deuterium and tritium.
    More example sentences
    • The three isotopes are sometimes known by the names of protium, deuterium, and tritium.
    • His hypothesis was that the lighter and more abundant protium isotope would evaporate more quickly than the heavier hydrogen - 2 isotope.


1930s: modern Latin, from Greek prōtos 'first'.

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