deuterium C2 Topic:Science & Research US /djuːˈtɪɹi.əm/ UK /djuːˈtɪəɹɪəm/ See IPA manual Freq #45234 Meanings 1 noun An isotope of hydrogen with one proton and one neutron in each atom - 21H. Heavy water is "heavy" because it contains deuterium. 2 noun An atom of this isotope. There were about 80 deuteriums for every million protiums, and virtually no tritium. 3 noun an isotope of hydrogen which has one neutron (as opposed to zero neutrons in hydrogen) Thesaurus Synonyms 1 noun · an isotope of hydrogen with... heavy hydrogenhydrogen 2hydrogen-2mul:h-2mul:²h 3 noun · an isotope of hydrogen... heavy hydrogen Word family Derived forms antideuterium Related forms deuterondeuteronomy Common collocations deuterium oxide Noun + noun Etymology From deutero- + -ium. Coined by American physical chemist Harold Urey, from Ancient Greek δεύτερος (deúteros, “second”). Topics Science & Research External links Cambridge Dictionary Wiktionary Google Images # deuterium **Type:** Word **Level:** C2 **Part of speech:** noun **IPA (US):** /djuːˈtɪɹi.əm/ **IPA (UK):** /djuːˈtɪəɹɪəm/ **Frequency rank:** 45234 ## Meanings 1. An isotope of hydrogen with one proton and one neutron in each atom - 21H. 2. An atom of this isotope. 3. an isotope of hydrogen which has one neutron (as opposed to zero neutrons in hydrogen) ## Examples - Heavy water is "heavy" because it contains deuterium. - There were about 80 deuteriums for every million protiums, and virtually no tritium. ## Derived Forms - antideuterium ## Related Forms - deuteron - deuteronomy ## Etymology From deutero- + -ium. Coined by American physical chemist Harold Urey, from Ancient Greek δεύτερος (deúteros, “second”). ## Topics - Science & Research markdown