radioactive iodine uptake test ra·dioac·ti·veiodineuptaketest uncommon noun 1. radioactive iodine test that measures the amount of radioactive iodine taken up by the thyroid gland Synonymsradioactive iodine uptake testRAIU Related words Broader terms radioactive iodine test WordNet 2.1 (Princeton University). WordNet 2.1 Copyright Princeton University. All rights reserved.
