| NOUN | substance | heavy hydrogen, deuterium | an isotope of hydrogen which has one neutron (as opposed to zero neutrons in hydrogen) |
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| Meaning | An isotope of hydrogen which has one neutron (as opposed to zero neutrons in hydrogen). | |
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| Synonym | deuterium | |
| Broader | hydrogen atom | An atom of hydrogen |
| isotope | One of two or more atoms with the same atomic number but with different numbers of neutrons | |
| Spanish | deuterio | |
| Catalan | deuteri | |
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