Definition of protium in English:

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protium

Pronunciation: /ˈprōdēəm/
/ˈprōSHəm/

noun

Chemistry
The common, stable isotope of hydrogen, as distinct from deuterium and tritium.
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.

Origin

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

For editors and proofreaders

Syllabification: pro·ti·um

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