WordReference Random House Unabridged Dictionary of American English © 2025
hy′drogen i′odide, 
  1. Chemistrya colorless gas, HI, having a suffocating odor: the anhydride of hydriodic acid.
  • 1895–1900

Collins Concise English Dictionary © HarperCollins Publishers::
hydrogen iodide
  1. a colourless poisonous corrosive gas obtained by a catalysed reaction between hydrogen and iodine vapour: used in making iodides. Formula: HI
  2. an aqueous solution of this gas; hydriodic acid
'hydrogen iodide' also found in these entries (note: many are not synonyms or translations):
hydriodic acid

Forum discussions with the word(s) "hydrogen iodide" in the title:


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