/ Thesaurus / R Synonyms of radioactive iodine uptake test Find synonyms for: Noun1. radioactive iodine uptake test, RAIU, radioactive iodine testusage: radioactive iodine test that measures the amount of radioactive iodine taken up by the thyroid glandWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: penurious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language