raiu raita • raj · · · Info · Definitions · Synonyms · Characters · · raiu · · Text Latin · · Script 4 · · Length 2 · · Syllables Definitions · · · (noun) radioactive iodine test that measures the amount of radioactive iodine taken up by the thyroid gland. Synonyms: radioactive iodine uptake test, RAIU. · · Noun Definition 1 Synonyms · · · radioactive iodine uptake test · · Synonym 1 Characters · · a latin small letter a U+0061 i latin small letter i U+0069 r latin small letter r U+0072 u latin small letter u U+0075