Dictionary

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

First Known Use of HEAVY WATER

1933

heavy water

noun    (Medical Dictionary)

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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