from The Century Dictionary.

  • Produced by the combination of hydrogen and iodine.

from the GNU version of the Collaborative International Dictionary of English.

  • adjective (Chem.) Pertaining to, or derived from, hydrogen and iodine; -- said of an acid (HI) produced by the combination of these elements.
  • adjective (Chem.) a pungent, colorless gas, HI, usually prepared as a solution in water. It is strong reducing agent. Called also hydrogen iodide.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • adjective Of or pertaining to hydriodic acid or its derivatives


from Wiktionary, Creative Commons Attribution/Share-Alike License

Ultimately from hydrogen + iodine


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  • Many of the poisonous acids, such as hydriodic, benzoic, hippuric, and carbolic (but I neglected to record all the cases), caused the secretion of an extraordinary amount of mucus, so that long ropes of this matter hung from the leaves when they were lifted out of the solutions.

    Insectivorous Plants Charles Darwin 1845

  • The pilot apparently radioed to say that he was having hydriodic problems.

    CNN Transcript Mar 9, 2007 2007

  • I do not want to go into details, but would nevertheless stress the enormous simplification of the micro-apparatus as compared with the macro-procedure in connection with the methoxy determination; the weighing of the substance in tin-foil caps is new in principle and of great advantage, as the hydriodic acid does not bump because of its tin iodide content.

    Fritz Pregl - Nobel Lecture 1966

  • For the methylimide determination, the fact that the ratio of the hydriodic acid to the substance quantity used (approx. 3 mg) would be far more favourable than for the macro-analytical process, had not been foreseen.

    Fritz Pregl - Nobel Lecture 1966

  • In absence of the latter, and therefore in presence of compounds which destroy or absorb hydriodic acid -- e.g. iodic acid -- there results a _brown_ addition product.

    Researches on Cellulose 1895-1900 C. F. Cross

  • The salts of hydriodic acid, the iodides, are, in general, similar to the chlorides and bromides.

    An Elementary Study of Chemistry William McPherson

  • The ether gradually absorbs oxygen from the atmosphere, being converted into acetic acid; this, by its superior affinities, reacts on the iodide present, converting it into acetate, with liberation of hydriodic acid; while this latter, under the influence of the atmospheric oxygen, is very rapidly converted into water and iodine.

    Notes and Queries, Number 227, March 4, 1854 A Medium of Inter-communication for Literary Men, Artists, Antiquaries, Genealogists, etc. Various

  • Give the formula for the salt which phosphine forms with hydriodic acid.

    An Elementary Study of Chemistry William McPherson

  • The iodide of silver in like manner is changed into a sub-iodide; but with water hydriodic acid is formed unless an iodine absorbent be present -- then into hypoiodic acid.

    Scientific American Supplement, No. 288, July 9, 1881 Various

  • Thus the main tissue is stained blue by iodine in presence of hydriodic acid (1.5 s.g.), and the colour is not changed on washing.

    Researches on Cellulose 1895-1900 C. F. Cross


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