WordReference Random House Unabridged Dictionary of American English © 2025
heavy hydrogen, 
    1. Chemistryeither of the heavy isotopes of hydrogen, esp. deuterium.
    2. Chemistrydeuterium.
    • 1930–35

Collins Concise English Dictionary © HarperCollins Publishers::
heavy hydrogen
  1. another name for deuterium
'heavy hydrogen' also found in these entries (note: many are not synonyms or translations):

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