deuterium.
An isotope of hydrogen with one proton and one neutron in each atom - 21H.
Meaning & usage
An isotope of hydrogen with one proton and one neutron in each atom - 21H.
Heavy water is "heavy" because it contains deuterium.
An atom of this isotope.
There were about 80 deuteriums for every million protiums, and virtually no tritium.
Where this word comes from
From deutero- + -ium. Coined by American physical chemist Harold Urey, from Ancient Greek δεύτερος (deúteros, “second”).
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Definitions, grammatical labels, IPA, etymology and examples: Wiktionary contributors, extracted by Kaikki / Wiktextract. Adapted under CC BY-SA 4.0. Selected fields and authored examples are shown; third-party quotations and audio are omitted. See contributor history.
Last enriched 2026-09-10. Definitions are in English. Romanizations are shown when supplied by the source; syllable estimates are omitted for unsupported scripts.