| NOUN | substance | deuterium oxide, heavy water | water containing a substantial proportion of deuterium atoms, used in nuclear reactors |
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| Meaning | water containing a substantial proportion of deuterium atoms, used in nuclear reactors. | |
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| Synonym | heavy water | |
| Broader | moderator | Any substance used to slow down neutrons in nuclear reactors |
| Spanish | agua pesada, óxido de deuterio | |
| Catalan | aigua pesant, òxid de deuteri | |
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