Definition of hydriodic acid in US English:

hydriodic acid


  • A strongly acidic solution of the gas hydrogen iodide in water.

    Chemical formula: HI

    • ‘The hydriodic acid is then distilled.’
    • ‘The principal chemicals are ephedrine or pseudoephedrine, hydriodic acid, and red phosphorus.’
    • ‘In this way, by adding phosphorus to the reaction mixture, hydrogen iodide is recycled and the reducing efficiency of hydriodic acid is enhanced.’
    • ‘There are three essential chemicals required for this method of methamphetamine production: Ephedrine or pseudoephedrine, hydriodic acid and red phosphorous.’
    • ‘In the method of the present invention, the hydriodic acid is administered orally, as hydriodic syrup.’


Early 19th century: hydriodic from a blend of hydrogen and iodine.


hydriodic acid

/ˌhīdrēˌädik ˈasid/