deuterium deuteride • deuterium oxide · · · Info · Definitions · Synonyms · Characters · · deuterium · · Text Latin · · Script 9 · · Length 5 · · Syllables Definitions · · · (noun) an isotope of hydrogen which has one neutron (as opposed to zero neutrons in hydrogen). Synonyms: heavy hydrogen. · · Noun Definition 1 Synonyms · · · heavy hydrogen · · Synonym 1 Characters · · d latin small letter d U+0064 e latin small letter e U+0065 i latin small letter i U+0069 m latin small letter m U+006D r latin small letter r U+0072 t latin small letter t U+0074 u latin small letter u U+0075