tritium

== English == === Etymology === Borrowed from New Latin tritium, from Ancient Greek τρίτος (trítos, “third”) + New Latin -ium. === Pronunciation === (Received Pronunciation) IPA(key): /ˈtɹɪt.i.əm/ (General American) IPA(key): /ˈtɹɪt.i.əm/, /ˈtrɪʃ.i.əm/, /ˈtrɪʃ.əm/ Rhymes: -ɪtiəm, -ɪʃiəm, -ɪʃəm === Noun === tritium (countable and uncountable, plural tritiums) (physics) A radioactive isotope of the element hydrogen (symbol T, 3H or 31H) having one proton and two neutrons. Alternative form: T (deprecated symbol) Synonyms: H-3, ³H, hydrogen-3, hydrogen 3 Hypernyms: hydrogen, H Coordinate terms: protium, H-1, ¹H, hydrogen-1, hydrogen 1, normal hydrogen, light hydrogen (1 nucleon); H-2, ²H, D, hydrogen-2, hydrogen 2, heavy hydrogen (2 nucleons); H-4, ⁴H, Q, quadrium, hydrogen-4, hydrogen 4 (4 nucleons); hyperhydrogen An atom of this isotope. ==== Usage notes ==== IUPAC recommends that the chemical symbol for tritium should be 3H, rather than T; to prevent problems in alphabetical sorting of formulae. Likewise, deuterium should have the chemical symbol 2H, rather than D. ==== Derived terms ==== tritium oxide ==== Related terms ==== triton ==== Translations ==== === References === Elementymology “tritium”, in Collins English Dictionary. === Anagrams === ittrium == Danish == === Etymology === From Ancient Greek τρίτος (trítos) +‎ -ium. === Noun === tritium n (singular definite tritiummet, not used in plural form) tritium Coordinate terms: protium, deuterium ==== Declension ==== == Dutch == === Etymology === From Ancient Greek τρίτος (trítos, “third”) +‎ -ium. === Pronunciation === Hyphenation: tri‧ti‧um === Noun === tritium n (uncountable, no diminutive) tritium == Finnish == === Etymology === From English tritium. === Pronunciation === IPA(key): /ˈtritium/, [ˈt̪rit̪ium] Rhymes: -itium Syllabification(key): tri‧ti‧um Hyphenation(key): tri‧ti‧um === Noun === tritium (physics) tritium ==== Declension ==== == French == === Pronunciation === === Noun === tritium m (plural tritiums) tritium === Further reading === “tritium”, in Trésor de la langue française informatisé [Digitized Treasury of the French Language], 2012 == Latin == === Pronunciation === (Classical Latin) IPA(key): [ˈtrɪ.ti.ũː] (modern Italianate Ecclesiastical) IPA(key): [ˈtrit.t͡si.um] === Noun === tritium n (genitive tritiī or tritī); second declension tritium ==== Declension ==== Second-declension noun (neuter). 1Found in older Latin (until the Augustan Age).