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Deuterium

//djuːˈtɪɹi.əm// noun

Definitions

Noun
  1. 1
    An isotope of hydrogen with one proton and one neutron in each atom - ²₁H. uncountable

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

  2. 2
    an isotope of hydrogen which has one neutron (as opposed to zero neutrons in hydrogen) wordnet
  3. 3
    An atom of this isotope. countable

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

Etymology

From deutero- + -ium. Coined by American physical chemist Harold Urey, from Ancient Greek δεύτερος (deúteros, “second”).

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