Definition of "deuterium" in Englisch

noun

1. (uncountable, physics) An isotope of hydrogen with one proton and one neutron in each atom - ²₁H.

   • Heavy water is "heavy" because it contains deuterium.

2. (countable) An atom of this isotope.

   • There were about 80 deuteriums for every million protiums, and virtually no tritium.