deuterium
English Thesaurus
1. an isotope of hydrogen which has one neutron (as opposed to zero neutrons in hydrogen) (noun.substance)
| hypernym | : | isotope, |
| definition | : | one of two or more atoms with the same atomic number but with different numbers of neutrons (noun.substance) |
| hypernym | : | hydrogen atom, |
| definition | : | an atom of hydrogen (noun.substance) |
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