/ Thesaurus / H Synonyms of hydriodic acid Find synonyms for: Noun1. hydriodic acid, acidusage: (HI) a colorless or yellow aqueous solution of hydrogen iodide; "hydriodic acid is a strong acid"WordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: impetuous Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language