heavy water
noun
Definition of heavy water
1 : the compound D2O composed of deuterium and oxygen —called also deuterium oxide
2 : water enriched in deuterium
From the M-W Editors
First Known Use of heavy water
1933
Medical Dictionary
heavy water
noun
Medical Definition of heavy water
1: the compound D2O composed of deuterium and oxygen—called also deuterium oxide
2: water having a higher-than-usual proportion of deuterium among its hydrogen atoms
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