- another name for deuterium
WordReference Random House Unabridged Dictionary of American English © 2025
heav′y hy′drogen,
- Chemistryeither of the heavy isotopes of hydrogen, esp. deuterium.
- Chemistrydeuterium.
- 1930–35
Collins Concise English Dictionary © HarperCollins Publishers::
'heavy hydrogen' also found in these entries (note: many are not synonyms or translations):