• synonyms

hydrogen iodide


a colorless gas, HI, having a suffocating odor: the anhydride of hydriodic acid.


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Nearby words

hydrogen cyanide, hydrogen donor, hydrogen electrode, hydrogen embrittlement, hydrogen fluoride, hydrogen iodide, hydrogen ion, hydrogen peroxide, hydrogen sulfide, hydrogen sulphate, hydrogen sulphide

Origin of hydrogen iodide

First recorded in 1895–1900 Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

British Dictionary definitions for hydrogen iodide

hydrogen iodide


a colourless poisonous corrosive gas obtained by a catalysed reaction between hydrogen and iodine vapour: used in making iodides. Formula: HI
an aqueous solution of this gas; hydriodic acid
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012