tritium.
A radioactive isotope of the element hydrogen (symbol T, ³H or 31H) having one proton and two neutrons.
Meaning & usage
A radioactive isotope of the element hydrogen (symbol T, ³H or 31H) having one proton and two neutrons.
An atom of this isotope.
Where this word comes from
Borrowed from New Latin tritium, from Ancient Greek τρίτος (trítos, “third”) + New Latin -ium. By surface analysis, trit- + -ium.
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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.