tritium tritish • tritocerebral · · · Info · Definitions · Characters · · tritium · · Text Latin · · Script 7 · · Length 3 · · Syllables Definitions · · · (noun) a radioactive isotope of hydrogen; atoms of tritium have three times the mass of ordinary hydrogen atoms. · · Noun Definition 1 Characters · · 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