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Noun
1. heavy water
Wikipedia definition
2. Heavy waterHeavy water, formally called deuterium oxide or H2O, is a form of water that uses the hydrogen isotope deuterium, rather than the ordinary protium isotope. The colloquial term heavy water is often also used to refer a highly enriched water mixture that contains mostly deuterium oxide but also contains some ordinary water molecules as well; e.g.
Read “Heavy water” on English Wikipedia
Read “重水” on Japanese Wikipedia
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